Merge branch 'master' into viewport

# Conflicts: # examples/imgui_impl_vulkan.h # imgui.cpp
2024-12-19 06:26:35 +00:00 · 2018-08-22 21:35:44 +02:00 · 2018-08-22 21:35:44 +02:00 · a4191857c1
commit a4191857c1
parent 9d7480774f 7011d87bf8
15 changed files with 461 additions and 199 deletions
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@ -4,6 +4,9 @@ Hello!

 You may use the Issue Tracker to submit bug reports, feature requests or suggestions. You may ask for help or advice as well. However please read this wall of text before doing so. The amount of incomplete or ambiguous requests due to people not following those guidelines is often overwhelming. Please do your best to clarify your request. Thank you!

+**IF YOU ARE HAVING AN ISSUE COMPILING/LINKING/RUNNING/DISPLAYING/ADDING FONTS/WIRING INPUTS**
+- Please post on the "Getting Started" Discourse forum: https://discourse.dearimgui.org/c/getting-started
+
 **Prerequisites for new users of dear imgui:**
 - Please read the FAQ in imgui.cpp.
 - Please read misc/fonts/README.txt if your question relates to fonts or text.
--- a/.github/issue_template.md
+++ b/.github/issue_template.md
@ -1,6 +1,7 @@
-You may use the Issue Tracker to ask for help and submit bug reports, feature requests or suggestions. 
+IF YOU ARE HAVING AN ISSUE COMPILING/LINKING/RUNNING/DISPLAYING/ADDING FONTS/WIRING INPUTS, please post on the "Getting Started" Discourse forum:
+https://discourse.dearimgui.org/c/getting-started

-PLEASE CAREFULLY READ THIS DOCUMENT before submitting any issue:
+Otherwise, you may use this Issue Tracker to ask for help and submit bug reports, feature requests or suggestions. PLEASE CAREFULLY READ THIS DOCUMENT before submitting any issue:
 https://github.com/ocornut/imgui/blob/master/.github/CONTRIBUTING.md
 (Click "Preview" to turn the URL above into a clickable link)

--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@ -2,7 +2,7 @@
 - When adding a feature, please describe the usage context (how you intend to use it, why you need it, etc.).
 - When fixing a warning or compilation problem, please post the compiler log and specify the version and OS you are using.
 - Try to attach screenshots to clarify the context and demonstrate the feature at a glance.
- Make sure your code follows the coding style already used in imgui (spaces instead of tabs, "local_variable", "FunctionName", "MemberName", etc.). We don't use modern C++ idioms and can compile without C++11.
+- Make sure your code follows the coding style already used in imgui (4 spaces instead of tabs, "type* name", "local_variable", "FunctionName", "MemberName", etc.). We don't use modern C++ idioms and can compile without C++11.
 - Make sure you create a branch for the pull request. In Git, 1 PR is associated to 1 branch. If you keep pushing to the same branch after you submitted the PR, your new commits will appear in the PR.

 (Clear this form before submitting your PR)
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@ -39,6 +39,9 @@ Breaking Changes:
 - Changed ImGui::GetTime() return value from float to double to avoid accumulating floating point imprecisions over time.
 - Removed per-window ImGuiWindowFlags_ResizeFromAnySide beta flag in favor `io.ConfigResizeWindowsFromEdges=true` to enable the feature globally. (#1495)
   The feature is not currently enabled by default because it is not satisfying enough.
+ - InputText: Renamed ImGuiTextEditCallback to ImGuiInputTextCallback, ImGuiTextEditCallbackData to ImGuiInputTextCallbackData for consistency. 
+   Kept redirection types (will obsolete). 
+ - InputText: Removed ImGuiTextEditCallbackData::ReadOnly since it is a duplication of (ImGuiTextEditCallbackData::Flags & ImGuiInputTextFlags_ReadOnly).
 - Renamed io.OptCursorBlink to io.ConfigCursorBlink, io.OptMacOSXBehaviors to io.ConfigMacOSXBehaviors for consistency. (#1427, #473)

 Other Changes:
@ -51,6 +54,13 @@ Other Changes:
 - Window: Allow menu and popups windows from ignoring the style.WindowMinSize values so short menus/popups are not padded. (#1909)
 - Window: Added global io.OptResizeWindowsFromEdges option to enable resizing windows from their edges and from the lower-left corner. (#1495)
 - Window: Collapse button shows hovering highlight + clicking and dragging on it allows to drag the window as well. 
+ - InputText: Added support for buffer size/capacity changes via the ImGuiInputTextFlags_CallbackResize flag. (#2006, #1443, #1008).
+ - InputText: Fixed not tracking the cursor horizontally When modifying the text buffer through a callback.
+ - InputText: Fixed minor off-by-one issue when submitting a buffer size smaller than the initial zero-terminated buffer contents.
+ - InputText: Fixed a few pathological crash cases on single-line InputText widget with multiple millions characters worth of contents. 
+   Because the current text drawing function reserve for a worst-case amount of vertices and how we handle horizontal clipping,
+   we currently just avoid displaying those single-line widgets when they are over a threshold of 2 millions characters, 
+   until a better solution is found.
 - Drag and Drop: Fixed an incorrect assert when dropping a source that is submitted after the target (bug introduced with 1.62 changes 
   related to the addition of IsItemDeactivated()). (#1875, #143)
 - Drag and Drop: Fixed ImGuiDragDropFlags_SourceNoDisableHover to affect hovering state prior to calling IsItemHovered() + fixed description. (#143)
@ -60,6 +70,8 @@ Other Changes:
 - Drag and Drop: Added ImGuiDragDropFlags_SourceAutoExpirePayload flag to force payload to expire if the source stops being submitted. (#1725, #143).
 - IsItemHovered(): Added ImGuiHoveredFlags_AllowWhenDisabled flag to query hovered status on disabled items. (#1940, #211)
 - Selectable: Added ImGuiSelectableFlags_Disabled flag in the public API. (#211)
+ - Misc; Added optional misc/stl/imgui_stl.h wrapper to use with STL types (e.g. InputText with std::string). (#2006, #1443, #1008)
+ - Misc: Added IMGUI_VERSION_NUM for easy compile-time testing. (#2025)
 - Misc: Added ImGuiMouseCursor_Hand cursor enum + corresponding software cursor. (#1913, 1914) [@aiekick, @ocornut] 
 - Misc: Tweaked software mouse cursor offset to match the offset of the corresponding Windows 10 cursors.
 - Made assertion more clear when trying to call Begin() outside of the NewFrame()..EndFrame() scope. (#1987)
@ -67,12 +79,16 @@ Other Changes:
 - Fixed PushID() from keeping alive the new ID Stack top value (if a previously active widget shared the ID it would be erroneously kept alive).  
 - Fixed horizontal mouse wheel not forwarding the request to the parent window if ImGuiWindowFlags_NoScrollWithMouse is set. (#1463, #1380, #1502)
 - Fixed a include build issue for Cygwin in non-POSIX (Win32) mode. (#1917, #1319, #276)
+ - ImDrawList: Improved handling for worst-case vertices reservation policy when large amount of text (e.g. 1+ million character strings)
+   are being submitted in a single call. It would typically have crashed InputTextMultiline(). (#200)
 - OS/Windows: Fixed missing ImmReleaseContext() call in the default Win32 IME handler. (#1932) [@vby]
 - Metrics: Changed io.MetricsActiveWindows to reflect the number of active windows (!= from visible windows), which is useful
   for lazy/idle render mechanisms as new windows are typically not visible for one frame.
 - Metrics: Added io.MetricsRenderWindow to reflect the number of visible windows.
 - Metrics: Added io.MetricsActiveAllocations, moving away from the cross-context global counters than we previously used. (#1565, #1599, #586)
 - Demo: Added basic Drag and Drop demo. (#143)
+ - Demo: Modified the Console example to use InsertChars() in the input text callback instead of poking directly into the buffer.
+   Although this won't make a difference in the example itself, using InsertChars() will honor the resizing callback properly. (#2006, #1443, #1008).
 - Demo: Clarified the use of IsItemHovered()/IsItemActive() right after being in the "Active, Focused, Hovered & Focused Tests" section.
 - Examples: Tweaked the main.cpp of each example.
 - Examples: Metal: Added Metal rendering backend. (#1929, #1873) [@warrenm]
--- a/README.md
+++ b/README.md
@ -129,12 +129,11 @@ Frameworks:
 - Platform: GLFW, SDL, Win32, OSX, Freeglut: [examples/](https://github.com/ocornut/imgui/tree/master/examples)
 - Framework: Allegro 5, Marmalade: [examples/](https://github.com/ocornut/imgui/tree/master/examples)
 - Unmerged PR: SDL2 + OpenGLES + Emscripten: [#336](https://github.com/ocornut/imgui/pull/336)
- Unmerged PR: Native Win32 and OSX: [#281](https://github.com/ocornut/imgui/pull/281)
 - Unmerged PR: Android: [#421](https://github.com/ocornut/imgui/pull/421)
 - Unmerged PR: ORX: [#1843](https://github.com/ocornut/imgui/pull/1843)
 - Cinder: [Cinder-ImGui](https://github.com/simongeilfus/Cinder-ImGui)
 - Cocos2d-x: [imguix](https://github.com/c0i/imguix), [issue #551](https://github.com/ocornut/imgui/issues/551)
- Flexium/SFML: [FlexGUI](https://github.com/DXsmiley/FlexGUI)
+- Flexium: [FlexGUI](https://github.com/DXsmiley/FlexGUI)
 - GML/GameMakerStudio2: [ImGuiGML](https://marketplace.yoyogames.com/assets/6221/imguigml)
 - Irrlicht: [IrrIMGUI](https://github.com/ZahlGraf/IrrIMGUI)
 - Ogre: [ogreimgui](https://bitbucket.org/LMCrashy/ogreimgui/src)
@ -143,8 +142,8 @@ Frameworks:
 - LÖVE+Lua: [love-imgui](https://github.com/slages/love-imgui)
 - Magnum: [magnum-imgui](https://github.com/lecopivo/magnum-imgui), [MagnumImguiPort](https://github.com/lecopivo/MagnumImguiPort)
 - NanoRT: [syoyo/imgui](https://github.com/syoyo/imgui/tree/nanort)
- Qt3d: [imgui-qt3d](https://github.com/alpqr/imgui-qt3d)
- SFML: [imgui-sfml](https://github.com/EliasD/imgui-sfml) or [imgui-backends](https://github.com/Mischa-Alff/imgui-backends)
+- Qt3d: [imgui-qt3d](https://github.com/alpqr/imgui-qt3d), QOpenGLWindow [qtimgui](https://github.com/ocornut/imgui/issues/1910)
+- SFML: [imgui-sfml](https://github.com/EliasD/imgui-sfml)
 - Software renderer: [imgui_software_renderer](https://github.com/emilk/imgui_software_renderer)
 - Unreal Engine 4: [segross/UnrealImGui](https://github.com/segross/UnrealImGui) or [sronsse/UnrealEngine_ImGui](https://github.com/sronsse/UnrealEngine_ImGui)

@ -161,7 +160,6 @@ Some of the goals for 2018 are:

 Gallery
 -------
-
 User screenshots:
 <br>[Gallery Part 1](https://github.com/ocornut/imgui/issues/123) (Feb 2015 to Feb 2016)
 <br>[Gallery Part 2](https://github.com/ocornut/imgui/issues/539) (Feb 2016 to Aug 2016)
@ -213,6 +211,13 @@ The Immediate Mode GUI paradigm may at first appear unusual to some users. This

 See the [Wiki](https://github.com/ocornut/imgui/wiki) and [Bindings](https://github.com/ocornut/imgui/wiki/Bindings) for third-party bindings to different languages and frameworks.

+Support Forums
+--------------
+
+If you have issues with: compiling, linking, adding fonts, running or displaying Dear ImGui, or wiring inputs: please post on the Discourse forum: https://discourse.dearimgui.org/c/getting-started.
+
+For any other questions, bug reports, requests, feedback, you may post on https://github.com/ocornut/imgui/issues.
+
 Frequently Asked Question (FAQ)
 -------------------------------

--- a/TODO.txt
+++ b/TODO.txt
@ -66,7 +66,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
 - input text: expose CursorPos in char filter event (#816)
 - input text: access public fields via a non-callback API e.g. InputTextGetState("xxx") that may return NULL if not active.
 - input text: flag to disable live update of the user buffer (also applies to float/int text input) (#701)
- - input text: way to dynamically grow the buffer without forcing the user to initially allocate for worse case, e.g. more natural std::string (follow up on #200)
 - input text: hover tooltip could show unclamped text
 - input text: option to Tab after an Enter validation.
 - input text: add ImGuiInputTextFlags_EnterToApply? (off #218)
@ -80,6 +79,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
 - input text multi-line: line numbers? status bar? (follow up on #200)
 - input text multi-line: behave better when user changes input buffer while editing is active (even though it is illegal behavior). namely, the change of buffer can create a scrollbar glitch (#725)
 - input text multi-line: better horizontal scrolling support (#383, #1224)
+ - input text multi-line: single call to AddText() should be coarse clipped on InputTextEx() end.
 - input number: optional range min/max for Input*() functions
 - input number: holding [-]/[+] buttons could increase the step speed non-linearly (or user-controlled)
 - input number: use mouse wheel to step up/down
@ -240,13 +240,14 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
 - font: enforce monospace through ImFontConfig (for icons?) + create dual ImFont output from same input, reusing rasterized data but with different glyphs/AdvanceX
 - font: finish CustomRectRegister() to allow mapping Unicode codepoint to custom texture data 
 - font: PushFontSize API (#1018)
+ - font: MemoryTTF taking ownership confusing/not obvious, maybe default should be opposite?
 - font/atlas: add a missing Glyphs.reserve()
 - font/atlas: incremental updates
 - font/atlas: dynamic font atlas to avoid baking huge ranges into bitmap and make scaling easier.
 - font/atlas: allow user to submit its own primitive to be rectpacked, and allow to map them on a Unicode point.
- - font: MemoryTTF taking ownership confusing/not obvious, maybe default should be opposite?
- - font draw: vertical and/or rotated text renderer (#705) - vertical is easier clipping wise
- - font draw: need to be able to specify wrap start position.
+ - font/draw: vertical and/or rotated text renderer (#705) - vertical is easier clipping wise
+ - font/draw: need to be able to specify wrap start position.
+ - font/draw: better reserve policy for large horizontal block of text (shouldn't reserve for all clipped lines)
 - font: imgui_freetype.h alternative renderer (#618)
 - font: optimization: for monospace font (like the default one) we can trim IndexXAdvance as long as trailing value is == FallbackXAdvance (need to make sure TAB is still correct).
 - font: add support for kerning, probably optional. A) perhaps default to (32..128)^2 matrix ~ 9K entries = 36KB, then hash for non-ascii?. B) or sparse lookup into per-char list?
--- a/examples/imgui_impl_vulkan.cpp
+++ b/examples/imgui_impl_vulkan.cpp
@ -9,6 +9,9 @@
 // If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
 // https://github.com/ocornut/imgui

+// The aim of imgui_impl_vulkan.h/.cpp is to be usable in your engine without any modification. 
+// IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/
+
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2018-06-22: Inverted the parameters to ImGui_ImplVulkan_RenderDrawData() to be consistent with other bindings.
@ -219,8 +222,8 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm

    // Upload Vertex and index Data:
    {
-        ImDrawVert* vtx_dst;
-        ImDrawIdx* idx_dst;
+        ImDrawVert* vtx_dst = NULL;
+        ImDrawIdx* idx_dst = NULL;
        err = vkMapMemory(g_Device, fd->VertexBufferMemory, 0, vertex_size, 0, (void**)(&vtx_dst));
        check_vk_result(err);
        err = vkMapMemory(g_Device, fd->IndexBufferMemory, 0, index_size, 0, (void**)(&idx_dst));
@ -735,8 +738,19 @@ void ImGui_ImplVulkan_NewFrame()
 {
 }

+
 //-------------------------------------------------------------------------
-// Miscellaneous Vulkan Helpers
+// Internal / Miscellaneous Vulkan Helpers
+//-------------------------------------------------------------------------
+// You probably do NOT need to use or care about those functions. 
+// Those functions only exist because:
+//   1) they facilitate the readability and maintenance of the multiple main.cpp examples files.
+//   2) the upcoming multi-viewport feature will need them internally.
+// Generally we avoid exposing any kind of superfluous high-level helpers in the bindings, 
+// but it is too much code to duplicate everywhere so we exceptionally expose them.
+// Your application/engine will likely already have code to setup all that stuff (swap chain, render pass, frame buffers, etc.).
+// You may read this code to learn about Vulkan, but it is recommended you use you own custom tailored code to do equivalent work.
+// (those functions do not interact with any of the state used by the regular ImGui_ImplVulkan_XXX functions)
 //-------------------------------------------------------------------------

 #include <stdlib.h> // malloc
--- a/examples/imgui_impl_vulkan.h
+++ b/examples/imgui_impl_vulkan.h
@ -9,9 +9,12 @@
 // If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
 // https://github.com/ocornut/imgui

+// The aim of imgui_impl_vulkan.h/.cpp is to be usable in your engine without any modification. 
+// IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/
+
 #include <vulkan/vulkan.h>

-#define IMGUI_VK_QUEUED_FRAMES 2
+#define IMGUI_VK_QUEUED_FRAMES      2

 struct ImGui_ImplVulkan_InitInfo
 {
@ -26,24 +29,31 @@ struct ImGui_ImplVulkan_InitInfo
    void                            (*CheckVkResultFn)(VkResult err);
 };

+// Called by user code
 IMGUI_IMPL_API bool     ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo* info, VkRenderPass render_pass);
 IMGUI_IMPL_API void     ImGui_ImplVulkan_Shutdown();
 IMGUI_IMPL_API void     ImGui_ImplVulkan_NewFrame();
 IMGUI_IMPL_API void     ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer command_buffer);
-
-// Called by Init/NewFrame/Shutdown
-IMGUI_IMPL_API void     ImGui_ImplVulkan_InvalidateFontUploadObjects();
-IMGUI_IMPL_API void     ImGui_ImplVulkan_InvalidateDeviceObjects();
 IMGUI_IMPL_API bool     ImGui_ImplVulkan_CreateFontsTexture(VkCommandBuffer command_buffer);
+IMGUI_IMPL_API void     ImGui_ImplVulkan_InvalidateFontUploadObjects();
+
+// Called by ImGui_ImplVulkan_Init() might be useful elsewhere.
 IMGUI_IMPL_API bool     ImGui_ImplVulkan_CreateDeviceObjects();
+IMGUI_IMPL_API void     ImGui_ImplVulkan_InvalidateDeviceObjects();
+

 //-------------------------------------------------------------------------
-// Miscellaneous Vulkan Helpers
-// Generally we try to NOT provide any kind of superfluous high-level helpers in the examples. 
-// But for the purpose of allowing multi-windows, we need those internally anyway. The code being not trivial are exposing it for the benefit of the example code.
-// If your application/engine already has code to create all that data (swap chain, render pass, frame buffers, etc.) you can ignore all of this.
+// Internal / Miscellaneous Vulkan Helpers
 //-------------------------------------------------------------------------
-// NB: Those functions do NOT use any of the state used/affected by the regular ImGui_ImplVulkan_XXX functions.
+// You probably do NOT need to use or care about those functions. 
+// Those functions only exist because:
+//   1) they facilitate the readability and maintenance of the multiple main.cpp examples files.
+//   2) the multi-viewport / platform window implementation needs them internally.
+// Generally we avoid exposing any kind of superfluous high-level helpers in the bindings, 
+// but it is too much code to duplicate everywhere so we exceptionally expose them.
+// Your application/engine will likely already have code to setup all that stuff (swap chain, render pass, frame buffers, etc.).
+// You may read this code to learn about Vulkan, but it is recommended you use you own custom tailored code to do equivalent work.
+// (those functions do not interact with any of the state used by the regular ImGui_ImplVulkan_XXX functions)
 //-------------------------------------------------------------------------

 struct ImGui_ImplVulkanH_FrameData;
@ -56,9 +66,10 @@ IMGUI_IMPL_API VkSurfaceFormatKHR   ImGui_ImplVulkanH_SelectSurfaceFormat(VkPhys
 IMGUI_IMPL_API VkPresentModeKHR     ImGui_ImplVulkanH_SelectPresentMode(VkPhysicalDevice physical_device, VkSurfaceKHR surface, const VkPresentModeKHR* request_modes, int request_modes_count);
 IMGUI_IMPL_API int                  ImGui_ImplVulkanH_GetMinImageCountFromPresentMode(VkPresentModeKHR present_mode);

+// Helper structure to hold the data needed by one rendering frame
 struct ImGui_ImplVulkanH_FrameData
 {
-    uint32_t            BackbufferIndex;    // keep track of recently rendered swapchain frame indices
+    uint32_t            BackbufferIndex;        // Keep track of recently rendered swapchain frame indices
    VkCommandPool       CommandPool;
    VkCommandBuffer     CommandBuffer;
    VkFence             Fence;
@ -68,6 +79,7 @@ struct ImGui_ImplVulkanH_FrameData
    IMGUI_IMPL_API ImGui_ImplVulkanH_FrameData();
 };

+// Helper structure to hold the data needed by one rendering context into one OS window
 struct ImGui_ImplVulkanH_WindowData
 {
    int                 Width;
--- a/imgui.cpp
+++ b/imgui.cpp
@ -5,6 +5,7 @@
 // Newcomers, read 'Programmer guide' below for notes on how to setup Dear ImGui in your codebase.
 // Get latest version at https://github.com/ocornut/imgui
 // Releases change-log at https://github.com/ocornut/imgui/releases
+// Technical Support for Getting Started https://discourse.dearimgui.org/c/getting-started
 // Gallery (please post your screenshots/video there!): https://github.com/ocornut/imgui/issues/1269
 // Developed by Omar Cornut and every direct or indirect contributors to the GitHub.
 // This library is free but I need your support to sustain development and maintenance.
@ -317,6 +318,8 @@
 - 2018/XX/XX (1.XX) - Moved IME support functions from io.ImeSetInputScreenPosFn, io.ImeWindowHandle to the PlatformIO api.
 - 2018/XX/XX (1.XX) - removed io.DisplayVisibleMin, io.DisplayVisibleMax settings (it was used to clip within the DisplayMin..DisplayMax range, I don't know of anyone using it)

+ - 2018/08/21 (1.63) - renamed ImGuiTextEditCallback to ImGuiInputTextCallback, ImGuiTextEditCallbackData to ImGuiInputTextCallbackData for consistency. Kept redirection types (will obsolete).
+ - 2018/08/21 (1.63) - removed ImGuiInputTextCallbackData::ReadOnly since it is a duplication of (ImGuiInputTextCallbackData::Flags & ImGuiInputTextFlags_ReadOnly).
 - 2018/08/01 (1.63) - removed per-window ImGuiWindowFlags_ResizeFromAnySide beta flag in favor of a global io.ConfigResizeWindowsFromEdges to enable the feature.
 - 2018/08/01 (1.63) - renamed io.OptCursorBlink to io.ConfigCursorBlink, io.OptMacOSXBehaviors to ConfigMacOSXBehaviors for consistency.
 - 2018/07/22 (1.63) - changed ImGui::GetTime() return value from float to double to avoid accumulating floating point imprecisions over time.
@ -902,6 +905,8 @@ static ImVec2           CalcNextScrollFromScrollTargetAndClamp(ImGuiWindow* wind
 static void             AddDrawListToDrawData(ImVector<ImDrawList*>* out_list, ImDrawList* draw_list);
 static void             AddWindowToSortedBuffer(ImVector<ImGuiWindow*>* out_sorted_windows, ImGuiWindow* window);

+static ImRect           GetViewportRect();
+
 static bool             InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags flags, ImGuiTextEditCallback callback, void* user_data);
 static int              InputTextCalcTextLenAndLineCount(const char* text_begin, const char** out_text_end);
 static ImVec2           InputTextCalcTextSizeW(const ImWchar* text_begin, const ImWchar* text_end, const ImWchar** remaining = NULL, ImVec2* out_offset = NULL, bool stop_on_new_line = false);
@ -939,7 +944,7 @@ template<typename TYPE, typename SIGNEDTYPE, typename FLOATTYPE>
 static bool             DragBehaviorT(ImGuiDataType data_type, TYPE* v, float v_speed, const TYPE v_min, const TYPE v_max, const char* format, float power);

 template<typename TYPE, typename SIGNEDTYPE, typename FLOATTYPE>
-static bool             SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, TYPE* v, const TYPE v_min, const TYPE v_max, const char* format, float power, ImGuiSliderFlags flags);
+static bool             SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, TYPE* v, const TYPE v_min, const TYPE v_max, const char* format, float power, ImGuiSliderFlags flags, ImRect* out_grab_bb);
 }

 //-----------------------------------------------------------------------------
@ -2926,7 +2931,7 @@ void ImGui::SetCurrentContext(ImGuiContext* ctx)
 bool ImGui::DebugCheckVersionAndDataLayout(const char* version, size_t sz_io, size_t sz_style, size_t sz_vec2, size_t sz_vec4, size_t sz_vert)
 {
    bool error = false;
-    if (strcmp(version, IMGUI_VERSION)!=0) { error = true; IM_ASSERT(strcmp(version,IMGUI_VERSION)==0 && "Mismatch version string!");  }
+    if (strcmp(version, IMGUI_VERSION)!=0) { error = true; IM_ASSERT(strcmp(version,IMGUI_VERSION)==0 && "Mismatched version string!");  }
    if (sz_io    != sizeof(ImGuiIO))       { error = true; IM_ASSERT(sz_io    == sizeof(ImGuiIO)      && "Mismatched struct layout!"); }
    if (sz_style != sizeof(ImGuiStyle))    { error = true; IM_ASSERT(sz_style == sizeof(ImGuiStyle)   && "Mismatched struct layout!"); }
    if (sz_vec2  != sizeof(ImVec2))        { error = true; IM_ASSERT(sz_vec2  == sizeof(ImVec2)       && "Mismatched struct layout!"); }
@ -4680,9 +4685,9 @@ void ImGui::Shutdown(ImGuiContext* context)
        IM_DELETE(g.Viewports[i]);
    g.Viewports.clear();
    g.PrivateClipboard.clear();
-    g.InputTextState.Text.clear();
+    g.InputTextState.TextW.clear();
    g.InputTextState.InitialText.clear();
-    g.InputTextState.TempTextBuffer.clear();
+    g.InputTextState.TempBuffer.clear();

    for (int i = 0; i < g.SettingsWindows.Size; i++)
        IM_DELETE(g.SettingsWindows[i].Name);
@ -10226,7 +10231,7 @@ bool ImGui::InputScalarAsWidgetReplacement(const ImRect& bb, ImGuiID id, const c
        SetHoveredID(id);
    }
    if (value_changed)
-        return DataTypeApplyOpFromText(data_buf, g.InputTextState.InitialText.begin(), data_type, data_ptr, NULL);
+        return DataTypeApplyOpFromText(data_buf, g.InputTextState.InitialText.Data, data_type, data_ptr, NULL);
    return false;
 }

@ -10356,10 +10361,9 @@ static inline float SliderBehaviorCalcRatioFromValue(ImGuiDataType data_type, TY

 // FIXME: Move some of the code into SliderBehavior(). Current responsability is larger than what the equivalent DragBehaviorT<> does, we also do some rendering, etc.
 template<typename TYPE, typename SIGNEDTYPE, typename FLOATTYPE>
-static bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, TYPE* v, const TYPE v_min, const TYPE v_max, const char* format, float power, ImGuiSliderFlags flags)
+static bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, TYPE* v, const TYPE v_min, const TYPE v_max, const char* format, float power, ImGuiSliderFlags flags, ImRect* out_grab_bb)
 {
    ImGuiContext& g = *GImGui;
-    ImGuiWindow* window = g.CurrentWindow;
    const ImGuiStyle& style = g.Style;

    const bool is_horizontal = (flags & ImGuiSliderFlags_Vertical) == 0;
@ -10506,17 +10510,15 @@ static bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType d
        }
    }

-    // Draw
+    // Output grab position so it can be displayed by the caller
    float grab_t = SliderBehaviorCalcRatioFromValue<TYPE,FLOATTYPE>(data_type, *v, v_min, v_max, power, linear_zero_pos);
    if (!is_horizontal)
        grab_t = 1.0f - grab_t;
    const float grab_pos = ImLerp(slider_usable_pos_min, slider_usable_pos_max, grab_t);
-    ImRect grab_bb;
    if (is_horizontal)
-        grab_bb = ImRect(grab_pos - grab_sz*0.5f, bb.Min.y + grab_padding, grab_pos + grab_sz*0.5f, bb.Max.y - grab_padding);
+        *out_grab_bb = ImRect(grab_pos - grab_sz*0.5f, bb.Min.y + grab_padding, grab_pos + grab_sz*0.5f, bb.Max.y - grab_padding);
    else
-        grab_bb = ImRect(bb.Min.x + grab_padding, grab_pos - grab_sz*0.5f, bb.Max.x - grab_padding, grab_pos + grab_sz*0.5f);
-    window->DrawList->AddRectFilled(grab_bb.Min, grab_bb.Max, GetColorU32(g.ActiveId == id ? ImGuiCol_SliderGrabActive : ImGuiCol_SliderGrab), style.GrabRounding);
+        *out_grab_bb = ImRect(bb.Min.x + grab_padding, grab_pos - grab_sz*0.5f, bb.Max.x - grab_padding, grab_pos + grab_sz*0.5f);

    return value_changed;
 }
@ -10524,34 +10526,28 @@ static bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType d
 // For 32-bits and larger types, slider bounds are limited to half the natural type range.
 // So e.g. an integer Slider between INT_MAX-10 and INT_MAX will fail, but an integer Slider between INT_MAX/2-10 and INT_MAX/2 will be ok.
 // It would be possible to lift that limitation with some work but it doesn't seem to be worth it for sliders.
-bool ImGui::SliderBehavior(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, void* v, const void* v_min, const void* v_max, const char* format, float power, ImGuiSliderFlags flags)
+bool ImGui::SliderBehavior(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, void* v, const void* v_min, const void* v_max, const char* format, float power, ImGuiSliderFlags flags, ImRect* out_grab_bb)
 {
-    // Draw frame
-    ImGuiContext& g = *GImGui;
-    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : g.HoveredId == id ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
-    RenderNavHighlight(bb, id);
-    RenderFrame(bb.Min, bb.Max, frame_col, true, g.Style.FrameRounding);
-
    switch (data_type)
    {
    case ImGuiDataType_S32:
        IM_ASSERT(*(const ImS32*)v_min >= IM_S32_MIN/2 && *(const ImS32*)v_max <= IM_S32_MAX/2);
-        return SliderBehaviorT<ImS32, ImS32, float >(bb, id, data_type, (ImS32*)v,  *(const ImS32*)v_min,  *(const ImS32*)v_max,  format, power, flags);
+        return SliderBehaviorT<ImS32, ImS32, float >(bb, id, data_type, (ImS32*)v,  *(const ImS32*)v_min,  *(const ImS32*)v_max,  format, power, flags, out_grab_bb);
    case ImGuiDataType_U32:
        IM_ASSERT(*(const ImU32*)v_min <= IM_U32_MAX/2);
-        return SliderBehaviorT<ImU32, ImS32, float >(bb, id, data_type, (ImU32*)v,  *(const ImU32*)v_min,  *(const ImU32*)v_max,  format, power, flags);
+        return SliderBehaviorT<ImU32, ImS32, float >(bb, id, data_type, (ImU32*)v,  *(const ImU32*)v_min,  *(const ImU32*)v_max,  format, power, flags, out_grab_bb);
    case ImGuiDataType_S64:
        IM_ASSERT(*(const ImS64*)v_min >= IM_S64_MIN/2 && *(const ImS64*)v_max <= IM_S64_MAX/2);
-        return SliderBehaviorT<ImS64, ImS64, double>(bb, id, data_type, (ImS64*)v,  *(const ImS64*)v_min,  *(const ImS64*)v_max,  format, power, flags);
+        return SliderBehaviorT<ImS64, ImS64, double>(bb, id, data_type, (ImS64*)v,  *(const ImS64*)v_min,  *(const ImS64*)v_max,  format, power, flags, out_grab_bb);
    case ImGuiDataType_U64:
        IM_ASSERT(*(const ImU64*)v_min <= IM_U64_MAX/2);
-        return SliderBehaviorT<ImU64, ImS64, double>(bb, id, data_type, (ImU64*)v,  *(const ImU64*)v_min,  *(const ImU64*)v_max,  format, power, flags);
+        return SliderBehaviorT<ImU64, ImS64, double>(bb, id, data_type, (ImU64*)v,  *(const ImU64*)v_min,  *(const ImU64*)v_max,  format, power, flags, out_grab_bb);
    case ImGuiDataType_Float:
        IM_ASSERT(*(const float*)v_min >= -FLT_MAX/2.0f && *(const float*)v_max <= FLT_MAX/2.0f);
-        return SliderBehaviorT<float, float, float >(bb, id, data_type, (float*)v,  *(const float*)v_min,  *(const float*)v_max,  format, power, flags);
+        return SliderBehaviorT<float, float, float >(bb, id, data_type, (float*)v,  *(const float*)v_min,  *(const float*)v_max,  format, power, flags, out_grab_bb);
    case ImGuiDataType_Double:
        IM_ASSERT(*(const double*)v_min >= -DBL_MAX/2.0f && *(const double*)v_max <= DBL_MAX/2.0f);
-        return SliderBehaviorT<double,double,double>(bb, id, data_type, (double*)v, *(const double*)v_min, *(const double*)v_max, format, power, flags);
+        return SliderBehaviorT<double,double,double>(bb, id, data_type, (double*)v, *(const double*)v_min, *(const double*)v_max, format, power, flags, out_grab_bb);
    case ImGuiDataType_COUNT: break;
    }
    IM_ASSERT(0);
@ -10631,12 +10627,22 @@ bool ImGui::SliderScalar(const char* label, ImGuiDataType data_type, void* v, co
    if (start_text_input || (g.ActiveId == id && g.ScalarAsInputTextId == id))
        return InputScalarAsWidgetReplacement(frame_bb, id, label, data_type, v, format);

-    // Actual slider behavior + render grab
    ItemSize(total_bb, style.FramePadding.y);
-    const bool value_changed = SliderBehavior(frame_bb, id, data_type, v, v_min, v_max, format, power);
+
+    // Draw frame
+    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : g.HoveredId == id ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
+    RenderNavHighlight(frame_bb, id);
+    RenderFrame(frame_bb.Min, frame_bb.Max, frame_col, true, g.Style.FrameRounding);
+
+    // Slider behavior
+    ImRect grab_bb;
+    const bool value_changed = SliderBehavior(frame_bb, id, data_type, v, v_min, v_max, format, power, ImGuiSliderFlags_None, &grab_bb);
    if (value_changed)
        MarkItemValueChanged(id);

+    // Render grab
+    window->DrawList->AddRectFilled(grab_bb.Min, grab_bb.Max, GetColorU32(g.ActiveId == id ? ImGuiCol_SliderGrabActive : ImGuiCol_SliderGrab), style.GrabRounding);
+
    // Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
    char value_buf[64];
    const char* value_buf_end = value_buf + DataTypeFormatString(value_buf, IM_ARRAYSIZE(value_buf), data_type, v, format);
@ -10688,11 +10694,21 @@ bool ImGui::VSliderScalar(const char* label, const ImVec2& size, ImGuiDataType d
        g.ActiveIdAllowNavDirFlags = (1 << ImGuiDir_Left) | (1 << ImGuiDir_Right);
    }

-    // Actual slider behavior + render grab
-    const bool value_changed = SliderBehavior(frame_bb, id, data_type, v, v_min, v_max, format, power, ImGuiSliderFlags_Vertical);
+
+    // Draw frame
+    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : g.HoveredId == id ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
+    RenderNavHighlight(frame_bb, id);
+    RenderFrame(frame_bb.Min, frame_bb.Max, frame_col, true, g.Style.FrameRounding);
+
+    // Slider behavior
+    ImRect grab_bb;
+    const bool value_changed = SliderBehavior(frame_bb, id, data_type, v, v_min, v_max, format, power, ImGuiSliderFlags_Vertical, &grab_bb);
    if (value_changed)
        MarkItemValueChanged(id);

+    // Render grab
+    window->DrawList->AddRectFilled(grab_bb.Min, grab_bb.Max, GetColorU32(g.ActiveId == id ? ImGuiCol_SliderGrabActive : ImGuiCol_SliderGrab), style.GrabRounding);
+
    // Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
    // For the vertical slider we allow centered text to overlap the frame padding
    char value_buf[64];
@ -11486,13 +11502,13 @@ namespace ImGuiStb
 {

 static int     STB_TEXTEDIT_STRINGLEN(const STB_TEXTEDIT_STRING* obj)                             { return obj->CurLenW; }
-static ImWchar STB_TEXTEDIT_GETCHAR(const STB_TEXTEDIT_STRING* obj, int idx)                      { return obj->Text[idx]; }
-static float   STB_TEXTEDIT_GETWIDTH(STB_TEXTEDIT_STRING* obj, int line_start_idx, int char_idx)  { ImWchar c = obj->Text[line_start_idx+char_idx]; if (c == '\n') return STB_TEXTEDIT_GETWIDTH_NEWLINE; return GImGui->Font->GetCharAdvance(c) * (GImGui->FontSize / GImGui->Font->FontSize); }
+static ImWchar STB_TEXTEDIT_GETCHAR(const STB_TEXTEDIT_STRING* obj, int idx)                      { return obj->TextW[idx]; }
+static float   STB_TEXTEDIT_GETWIDTH(STB_TEXTEDIT_STRING* obj, int line_start_idx, int char_idx)  { ImWchar c = obj->TextW[line_start_idx+char_idx]; if (c == '\n') return STB_TEXTEDIT_GETWIDTH_NEWLINE; return GImGui->Font->GetCharAdvance(c) * (GImGui->FontSize / GImGui->Font->FontSize); }
 static int     STB_TEXTEDIT_KEYTOTEXT(int key)                                                    { return key >= 0x10000 ? 0 : key; }
 static ImWchar STB_TEXTEDIT_NEWLINE = '\n';
 static void    STB_TEXTEDIT_LAYOUTROW(StbTexteditRow* r, STB_TEXTEDIT_STRING* obj, int line_start_idx)
 {
-    const ImWchar* text = obj->Text.Data;
+    const ImWchar* text = obj->TextW.Data;
    const ImWchar* text_remaining = NULL;
    const ImVec2 size = InputTextCalcTextSizeW(text + line_start_idx, text + obj->CurLenW, &text_remaining, NULL, true);
    r->x0 = 0.0f;
@ -11504,10 +11520,10 @@ static void    STB_TEXTEDIT_LAYOUTROW(StbTexteditRow* r, STB_TEXTEDIT_STRING* ob
 }

 static bool is_separator(unsigned int c)                                        { return ImCharIsBlankW(c) || c==',' || c==';' || c=='(' || c==')' || c=='{' || c=='}' || c=='[' || c==']' || c=='|'; }
-static int  is_word_boundary_from_right(STB_TEXTEDIT_STRING* obj, int idx)      { return idx > 0 ? (is_separator( obj->Text[idx-1] ) && !is_separator( obj->Text[idx] ) ) : 1; }
+static int  is_word_boundary_from_right(STB_TEXTEDIT_STRING* obj, int idx)      { return idx > 0 ? (is_separator( obj->TextW[idx-1] ) && !is_separator( obj->TextW[idx] ) ) : 1; }
 static int  STB_TEXTEDIT_MOVEWORDLEFT_IMPL(STB_TEXTEDIT_STRING* obj, int idx)   { idx--; while (idx >= 0 && !is_word_boundary_from_right(obj, idx)) idx--; return idx < 0 ? 0 : idx; }
 #ifdef __APPLE__    // FIXME: Move setting to IO structure
-static int  is_word_boundary_from_left(STB_TEXTEDIT_STRING* obj, int idx)       { return idx > 0 ? (!is_separator( obj->Text[idx-1] ) && is_separator( obj->Text[idx] ) ) : 1; }
+static int  is_word_boundary_from_left(STB_TEXTEDIT_STRING* obj, int idx)       { return idx > 0 ? (!is_separator( obj->TextW[idx-1] ) && is_separator( obj->TextW[idx] ) ) : 1; }
 static int  STB_TEXTEDIT_MOVEWORDRIGHT_IMPL(STB_TEXTEDIT_STRING* obj, int idx)  { idx++; int len = obj->CurLenW; while (idx < len && !is_word_boundary_from_left(obj, idx)) idx++; return idx > len ? len : idx; }
 #else
 static int  STB_TEXTEDIT_MOVEWORDRIGHT_IMPL(STB_TEXTEDIT_STRING* obj, int idx)  { idx++; int len = obj->CurLenW; while (idx < len && !is_word_boundary_from_right(obj, idx)) idx++; return idx > len ? len : idx; }
@ -11517,14 +11533,14 @@ static int  STB_TEXTEDIT_MOVEWORDRIGHT_IMPL(STB_TEXTEDIT_STRING* obj, int idx)

 static void STB_TEXTEDIT_DELETECHARS(STB_TEXTEDIT_STRING* obj, int pos, int n)
 {
-    ImWchar* dst = obj->Text.Data + pos;
+    ImWchar* dst = obj->TextW.Data + pos;

    // We maintain our buffer length in both UTF-8 and wchar formats
    obj->CurLenA -= ImTextCountUtf8BytesFromStr(dst, dst + n);
    obj->CurLenW -= n;

    // Offset remaining text
-    const ImWchar* src = obj->Text.Data + pos + n;
+    const ImWchar* src = obj->TextW.Data + pos + n;
    while (ImWchar c = *src++)
        *dst++ = c;
    *dst = '\0';
@ -11532,23 +11548,31 @@ static void STB_TEXTEDIT_DELETECHARS(STB_TEXTEDIT_STRING* obj, int pos, int n)

 static bool STB_TEXTEDIT_INSERTCHARS(STB_TEXTEDIT_STRING* obj, int pos, const ImWchar* new_text, int new_text_len)
 {
+    const bool is_resizable = (obj->UserFlags & ImGuiInputTextFlags_CallbackResize) != 0;
    const int text_len = obj->CurLenW;
    IM_ASSERT(pos <= text_len);
-    if (new_text_len + text_len + 1 > obj->Text.Size)
-        return false;

    const int new_text_len_utf8 = ImTextCountUtf8BytesFromStr(new_text, new_text + new_text_len);
-    if (new_text_len_utf8 + obj->CurLenA + 1 > obj->BufSizeA)
+    if (!is_resizable && (new_text_len_utf8 + obj->CurLenA + 1 > obj->BufCapacityA))
        return false;

-    ImWchar* text = obj->Text.Data;
+    // Grow internal buffer if needed
+    if (new_text_len + text_len + 1 > obj->TextW.Size)
+    {
+        if (!is_resizable)
+            return false;
+        IM_ASSERT(text_len < obj->TextW.Size);
+        obj->TextW.resize(text_len + ImClamp(new_text_len * 4, 32, ImMax(256, new_text_len)) + 1);
+    }
+
+    ImWchar* text = obj->TextW.Data;
    if (pos != text_len)
        memmove(text + pos + new_text_len, text + pos, (size_t)(text_len - pos) * sizeof(ImWchar));
    memcpy(text + pos, new_text, (size_t)new_text_len * sizeof(ImWchar));

    obj->CurLenW += new_text_len;
    obj->CurLenA += new_text_len_utf8;
-    obj->Text[obj->CurLenW] = '\0';
+    obj->TextW[obj->CurLenW] = '\0';

    return true;
 }
@ -11575,17 +11599,22 @@ static bool STB_TEXTEDIT_INSERTCHARS(STB_TEXTEDIT_STRING* obj, int pos, const Im

 }

-void ImGuiTextEditState::OnKeyPressed(int key)
+void ImGuiInputTextState::OnKeyPressed(int key)
 {
    stb_textedit_key(this, &StbState, key);
    CursorFollow = true;
    CursorAnimReset();
 }

+ImGuiInputTextCallbackData::ImGuiInputTextCallbackData()
+{
+    memset(this, 0, sizeof(*this));
+}
+
 // Public API to manipulate UTF-8 text
 // We expose UTF-8 to the user (unlike the STB_TEXTEDIT_* functions which are manipulating wchar)
 // FIXME: The existence of this rarely exercised code path is a bit of a nuisance.
-void ImGuiTextEditCallbackData::DeleteChars(int pos, int bytes_count)
+void ImGuiInputTextCallbackData::DeleteChars(int pos, int bytes_count)
 {
    IM_ASSERT(pos + bytes_count <= BufTextLen);
    char* dst = Buf + pos;
@ -11603,11 +11632,25 @@ void ImGuiTextEditCallbackData::DeleteChars(int pos, int bytes_count)
    BufTextLen -= bytes_count;
 }

-void ImGuiTextEditCallbackData::InsertChars(int pos, const char* new_text, const char* new_text_end)
+void ImGuiInputTextCallbackData::InsertChars(int pos, const char* new_text, const char* new_text_end)
 {
+    const bool is_resizable = (Flags & ImGuiInputTextFlags_CallbackResize) != 0;
    const int new_text_len = new_text_end ? (int)(new_text_end - new_text) : (int)strlen(new_text);
-    if (new_text_len + BufTextLen + 1 >= BufSize)
-        return;
+    if (new_text_len + BufTextLen >= BufSize)
+    {
+        if (!is_resizable)
+            return;
+
+        // Contrary to STB_TEXTEDIT_INSERTCHARS() this is working in the UTF8 buffer, hence the midly similar code (until we remove the U16 buffer alltogether!)
+        ImGuiContext& g = *GImGui;
+        ImGuiInputTextState* edit_state = &g.InputTextState;
+        IM_ASSERT(edit_state->ID != 0 && g.ActiveId == edit_state->ID);
+        IM_ASSERT(Buf == edit_state->TempBuffer.Data);
+        int new_buf_size = BufTextLen + ImClamp(new_text_len * 4, 32, ImMax(256, new_text_len)) + 1;
+        edit_state->TempBuffer.reserve(new_buf_size + 1);
+        Buf = edit_state->TempBuffer.Data;
+        BufSize = edit_state->BufCapacityA = new_buf_size;
+    }

    if (BufTextLen != pos)
        memmove(Buf + pos + new_text_len, Buf + pos, (size_t)(BufTextLen - pos));
@ -11622,7 +11665,7 @@ void ImGuiTextEditCallbackData::InsertChars(int pos, const char* new_text, const
 }

 // Return false to discard a character.
-static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags flags, ImGuiTextEditCallback callback, void* user_data)
+static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
 {
    unsigned int c = *p_char;

@ -11663,8 +11706,8 @@ static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags f

    if (flags & ImGuiInputTextFlags_CallbackCharFilter)
    {
-        ImGuiTextEditCallbackData callback_data;
-        memset(&callback_data, 0, sizeof(ImGuiTextEditCallbackData));
+        ImGuiInputTextCallbackData callback_data;
+        memset(&callback_data, 0, sizeof(ImGuiInputTextCallbackData));
        callback_data.EventFlag = ImGuiInputTextFlags_CallbackCharFilter;
        callback_data.EventChar = (ImWchar)c;
        callback_data.Flags = flags;
@ -11680,15 +11723,19 @@ static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags f
 }

 // Edit a string of text
-// NB: when active, hold on a privately held copy of the text (and apply back to 'buf'). So changing 'buf' while active has no effect.
-// FIXME: Rather messy function partly because we are doing UTF8 > u16 > UTF8 conversions on the go to more easily handle stb_textedit calls. Ideally we should stay in UTF-8 all the time. See https://github.com/nothings/stb/issues/188
-bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2& size_arg, ImGuiInputTextFlags flags, ImGuiTextEditCallback callback, void* user_data)
+// - buf_size account for the zero-terminator, so a buf_size of 6 can hold "Hello" but not "Hello!".
+//   This is so we can easily call InputText() on static arrays using ARRAYSIZE() and to match 
+//   Note that in std::string world, capacity() would omit 1 byte used by the zero-terminator.
+// - When active, hold on a privately held copy of the text (and apply back to 'buf'). So changing 'buf' while the InputText is active has no effect.
+// - If you want to use ImGui::InputText() with std::string, see misc/stl/imgui_stl.h
+// (FIXME: Rather messy function partly because we are doing UTF8 > u16 > UTF8 conversions on the go to more easily handle stb_textedit calls. Ideally we should stay in UTF-8 all the time. See https://github.com/nothings/stb/issues/188)
+bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2& size_arg, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* callback_user_data)
 {
    ImGuiWindow* window = GetCurrentWindow();
    if (window->SkipItems)
        return false;

-    IM_ASSERT(!((flags & ImGuiInputTextFlags_CallbackHistory) && (flags & ImGuiInputTextFlags_Multiline))); // Can't use both together (they both use up/down keys)
+    IM_ASSERT(!((flags & ImGuiInputTextFlags_CallbackHistory) && (flags & ImGuiInputTextFlags_Multiline)));        // Can't use both together (they both use up/down keys)
    IM_ASSERT(!((flags & ImGuiInputTextFlags_CallbackCompletion) && (flags & ImGuiInputTextFlags_AllowTabInput))); // Can't use both together (they both use tab key)

    ImGuiContext& g = *GImGui;
@ -11699,6 +11746,9 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
    const bool is_editable = (flags & ImGuiInputTextFlags_ReadOnly) == 0;
    const bool is_password = (flags & ImGuiInputTextFlags_Password) != 0;
    const bool is_undoable = (flags & ImGuiInputTextFlags_NoUndoRedo) == 0;
+    const bool is_resizable = (flags & ImGuiInputTextFlags_CallbackResize) != 0;
+    if (is_resizable)
+        IM_ASSERT(callback != NULL); // Must provide a callback if you set the ImGuiInputTextFlags_CallbackResize flag!

    if (is_multiline) // Open group before calling GetID() because groups tracks id created within their scope, 
        BeginGroup();
@ -11750,14 +11800,14 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
    }

    // NB: we are only allowed to access 'edit_state' if we are the active widget.
-    ImGuiTextEditState& edit_state = g.InputTextState;
+    ImGuiInputTextState& edit_state = g.InputTextState;

    const bool focus_requested = FocusableItemRegister(window, id, (flags & (ImGuiInputTextFlags_CallbackCompletion|ImGuiInputTextFlags_AllowTabInput)) == 0);    // Using completion callback disable keyboard tabbing
    const bool focus_requested_by_code = focus_requested && (window->FocusIdxAllCounter == window->FocusIdxAllRequestCurrent);
    const bool focus_requested_by_tab = focus_requested && !focus_requested_by_code;

    const bool user_clicked = hovered && io.MouseClicked[0];
-    const bool user_scrolled = is_multiline && g.ActiveId == 0 && edit_state.Id == id && g.ActiveIdPreviousFrame == draw_window->GetIDNoKeepAlive("#SCROLLY");
+    const bool user_scrolled = is_multiline && g.ActiveId == 0 && edit_state.ID == id && g.ActiveIdPreviousFrame == draw_window->GetIDNoKeepAlive("#SCROLLY");
    const bool user_nav_input_start = (g.ActiveId != id) && ((g.NavInputId == id) || (g.NavActivateId == id && g.NavInputSource == ImGuiInputSource_NavKeyboard));

    bool clear_active_id = false;
@ -11771,17 +11821,18 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
            // Take a copy of the initial buffer value (both in original UTF-8 format and converted to wchar)
            // From the moment we focused we are ignoring the content of 'buf' (unless we are in read-only mode)
            const int prev_len_w = edit_state.CurLenW;
-            edit_state.Text.resize(buf_size+1);        // wchar count <= UTF-8 count. we use +1 to make sure that .Data isn't NULL so it doesn't crash.
-            edit_state.InitialText.resize(buf_size+1); // UTF-8. we use +1 to make sure that .Data isn't NULL so it doesn't crash.
-            ImStrncpy(edit_state.InitialText.Data, buf, edit_state.InitialText.Size);
+            const int init_buf_len = (int)strlen(buf);
+            edit_state.TextW.resize(buf_size+1);             // wchar count <= UTF-8 count. we use +1 to make sure that .Data isn't NULL so it doesn't crash.
+            edit_state.InitialText.resize(init_buf_len + 1); // UTF-8. we use +1 to make sure that .Data isn't NULL so it doesn't crash.
+            memcpy(edit_state.InitialText.Data, buf, init_buf_len + 1);
            const char* buf_end = NULL;
-            edit_state.CurLenW = ImTextStrFromUtf8(edit_state.Text.Data, edit_state.Text.Size, buf, NULL, &buf_end);
-            edit_state.CurLenA = (int)(buf_end - buf); // We can't get the result from ImFormatString() above because it is not UTF-8 aware. Here we'll cut off malformed UTF-8.
+            edit_state.CurLenW = ImTextStrFromUtf8(edit_state.TextW.Data, buf_size, buf, NULL, &buf_end);
+            edit_state.CurLenA = (int)(buf_end - buf); // We can't get the result from ImStrncpy() above because it is not UTF-8 aware. Here we'll cut off malformed UTF-8.
            edit_state.CursorAnimReset();

            // Preserve cursor position and undo/redo stack if we come back to same widget
            // FIXME: We should probably compare the whole buffer to be on the safety side. Comparing buf (utf8) and edit_state.Text (wchar).
-            const bool recycle_state = (edit_state.Id == id) && (prev_len_w == edit_state.CurLenW);
+            const bool recycle_state = (edit_state.ID == id) && (prev_len_w == edit_state.CurLenW);
            if (recycle_state)
            {
                // Recycle existing cursor/selection/undo stack but clamp position
@ -11790,7 +11841,7 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
            }
            else
            {
-                edit_state.Id = id;
+                edit_state.ID = id;
                edit_state.ScrollX = 0.0f;
                stb_textedit_initialize_state(&edit_state.StbState, !is_multiline);
                if (!is_multiline && focus_requested_by_code)
@ -11815,20 +11866,25 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2

    bool value_changed = false;
    bool enter_pressed = false;
+    int backup_current_text_length = 0;

    if (g.ActiveId == id)
    {
        if (!is_editable && !g.ActiveIdIsJustActivated)
        {
            // When read-only we always use the live data passed to the function
-            edit_state.Text.resize(buf_size+1);
+            edit_state.TextW.resize(buf_size+1);
            const char* buf_end = NULL;
-            edit_state.CurLenW = ImTextStrFromUtf8(edit_state.Text.Data, edit_state.Text.Size, buf, NULL, &buf_end);
+            edit_state.CurLenW = ImTextStrFromUtf8(edit_state.TextW.Data, edit_state.TextW.Size, buf, NULL, &buf_end);
            edit_state.CurLenA = (int)(buf_end - buf);
            edit_state.CursorClamp();
        }

-        edit_state.BufSizeA = buf_size;
+        backup_current_text_length = edit_state.CurLenA;
+        edit_state.BufCapacityA = buf_size;
+        edit_state.UserFlags = flags;
+        edit_state.UserCallback = callback;
+        edit_state.UserCallbackData = callback_user_data;

        // Although we are active we don't prevent mouse from hovering other elements unless we are interacting right now with the widget.
        // Down the line we should have a cleaner library-wide concept of Selected vs Active.
@ -11878,7 +11934,7 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
                {
                    // Insert character if they pass filtering
                    unsigned int c = (unsigned int)io.InputCharacters[n];
-                    if (InputTextFilterCharacter(&c, flags, callback, user_data))
+                    if (InputTextFilterCharacter(&c, flags, callback, callback_user_data))
                        edit_state.OnKeyPressed((int)c);
                }

@ -11932,14 +11988,14 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
            else if (is_editable)
            {
                unsigned int c = '\n'; // Insert new line
-                if (InputTextFilterCharacter(&c, flags, callback, user_data))
+                if (InputTextFilterCharacter(&c, flags, callback, callback_user_data))
                    edit_state.OnKeyPressed((int)c);
            }
        }
        else if ((flags & ImGuiInputTextFlags_AllowTabInput) && IsKeyPressedMap(ImGuiKey_Tab) && !io.KeyCtrl && !io.KeyShift && !io.KeyAlt && is_editable)
        {
            unsigned int c = '\t'; // Insert TAB
-            if (InputTextFilterCharacter(&c, flags, callback, user_data))
+            if (InputTextFilterCharacter(&c, flags, callback, callback_user_data))
                edit_state.OnKeyPressed((int)c);
        }
        else if (IsKeyPressedMap(ImGuiKey_Escape))
@ -11963,9 +12019,9 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
            {
                const int ib = edit_state.HasSelection() ? ImMin(edit_state.StbState.select_start, edit_state.StbState.select_end) : 0;
                const int ie = edit_state.HasSelection() ? ImMax(edit_state.StbState.select_start, edit_state.StbState.select_end) : edit_state.CurLenW;
-                edit_state.TempTextBuffer.resize((ie-ib) * 4 + 1);
-                ImTextStrToUtf8(edit_state.TempTextBuffer.Data, edit_state.TempTextBuffer.Size, edit_state.Text.Data+ib, edit_state.Text.Data+ie);
-                SetClipboardText(edit_state.TempTextBuffer.Data);
+                edit_state.TempBuffer.resize((ie-ib) * 4 + 1);
+                ImTextStrToUtf8(edit_state.TempBuffer.Data, edit_state.TempBuffer.Size, edit_state.TextW.Data+ib, edit_state.TextW.Data+ie);
+                SetClipboardText(edit_state.TempBuffer.Data);
            }
            if (is_cut)
            {
@ -11989,7 +12045,7 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
                    s += ImTextCharFromUtf8(&c, s, NULL);
                    if (c == 0)
                        break;
-                    if (c >= 0x10000 || !InputTextFilterCharacter(&c, flags, callback, user_data))
+                    if (c >= 0x10000 || !InputTextFilterCharacter(&c, flags, callback, callback_user_data))
                        continue;
                    clipboard_filtered[clipboard_filtered_len++] = (ImWchar)c;
                }
@ -12006,13 +12062,15 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2

    if (g.ActiveId == id)
    {
+        const char* apply_new_text = NULL;
+        int apply_new_text_length = 0;
        if (cancel_edit)
        {
            // Restore initial value. Only return true if restoring to the initial value changes the current buffer contents.
-            if (is_editable && strncmp(buf, edit_state.InitialText.Data, buf_size) != 0)
+            if (is_editable && strcmp(buf, edit_state.InitialText.Data) != 0)
            {
-                ImStrncpy(buf, edit_state.InitialText.Data, buf_size);
-                value_changed = true;
+                apply_new_text = edit_state.InitialText.Data;
+                apply_new_text_length = edit_state.InitialText.Size - 1;
            }
        }

@ -12027,8 +12085,8 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
            // FIXME-OPT: CPU waste to do this every time the widget is active, should mark dirty state from the stb_textedit callbacks.
            if (is_editable)
            {
-                edit_state.TempTextBuffer.resize(edit_state.Text.Size * 4);
-                ImTextStrToUtf8(edit_state.TempTextBuffer.Data, edit_state.TempTextBuffer.Size, edit_state.Text.Data, NULL);
+                edit_state.TempBuffer.resize(edit_state.TextW.Size * 4 + 1);
+                ImTextStrToUtf8(edit_state.TempBuffer.Data, edit_state.TempBuffer.Size, edit_state.TextW.Data, NULL);
            }

            // User callback
@ -12059,21 +12117,20 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2

                if (event_flag)
                {
-                    ImGuiTextEditCallbackData callback_data;
-                    memset(&callback_data, 0, sizeof(ImGuiTextEditCallbackData));
+                    ImGuiInputTextCallbackData callback_data;
+                    memset(&callback_data, 0, sizeof(ImGuiInputTextCallbackData));
                    callback_data.EventFlag = event_flag;
                    callback_data.Flags = flags;
-                    callback_data.UserData = user_data;
-                    callback_data.ReadOnly = !is_editable;
+                    callback_data.UserData = callback_user_data;

                    callback_data.EventKey = event_key;
-                    callback_data.Buf = edit_state.TempTextBuffer.Data;
+                    callback_data.Buf = edit_state.TempBuffer.Data;
                    callback_data.BufTextLen = edit_state.CurLenA;
-                    callback_data.BufSize = edit_state.BufSizeA;
+                    callback_data.BufSize = edit_state.BufCapacityA;
                    callback_data.BufDirty = false;

                    // We have to convert from wchar-positions to UTF-8-positions, which can be pretty slow (an incentive to ditch the ImWchar buffer, see https://github.com/nothings/stb/issues/188)
-                    ImWchar* text = edit_state.Text.Data;
+                    ImWchar* text = edit_state.TextW.Data;
                    const int utf8_cursor_pos = callback_data.CursorPos = ImTextCountUtf8BytesFromStr(text, text + edit_state.StbState.cursor);
                    const int utf8_selection_start = callback_data.SelectionStart = ImTextCountUtf8BytesFromStr(text, text + edit_state.StbState.select_start);
                    const int utf8_selection_end = callback_data.SelectionEnd = ImTextCountUtf8BytesFromStr(text, text + edit_state.StbState.select_end);
@ -12082,29 +12139,61 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
                    callback(&callback_data);

                    // Read back what user may have modified
-                    IM_ASSERT(callback_data.Buf == edit_state.TempTextBuffer.Data);  // Invalid to modify those fields
-                    IM_ASSERT(callback_data.BufSize == edit_state.BufSizeA);
+                    IM_ASSERT(callback_data.Buf == edit_state.TempBuffer.Data);  // Invalid to modify those fields
+                    IM_ASSERT(callback_data.BufSize == edit_state.BufCapacityA);
                    IM_ASSERT(callback_data.Flags == flags);
-                    if (callback_data.CursorPos != utf8_cursor_pos)            edit_state.StbState.cursor = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.CursorPos);
-                    if (callback_data.SelectionStart != utf8_selection_start)  edit_state.StbState.select_start = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionStart);
-                    if (callback_data.SelectionEnd != utf8_selection_end)      edit_state.StbState.select_end = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionEnd);
+                    if (callback_data.CursorPos != utf8_cursor_pos)            { edit_state.StbState.cursor = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.CursorPos); edit_state.CursorFollow = true; }
+                    if (callback_data.SelectionStart != utf8_selection_start)  { edit_state.StbState.select_start = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionStart); }
+                    if (callback_data.SelectionEnd != utf8_selection_end)      { edit_state.StbState.select_end = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionEnd); }
                    if (callback_data.BufDirty)
                    {
                        IM_ASSERT(callback_data.BufTextLen == (int)strlen(callback_data.Buf)); // You need to maintain BufTextLen if you change the text!
-                        edit_state.CurLenW = ImTextStrFromUtf8(edit_state.Text.Data, edit_state.Text.Size, callback_data.Buf, NULL);
+                        if (callback_data.BufTextLen > backup_current_text_length && is_resizable)
+                            edit_state.TextW.resize(edit_state.TextW.Size + (callback_data.BufTextLen - backup_current_text_length));
+                        edit_state.CurLenW = ImTextStrFromUtf8(edit_state.TextW.Data, edit_state.TextW.Size, callback_data.Buf, NULL);
                        edit_state.CurLenA = callback_data.BufTextLen;  // Assume correct length and valid UTF-8 from user, saves us an extra strlen()
                        edit_state.CursorAnimReset();
                    }
                }
            }

-            // Copy back to user buffer
-            if (is_editable && strcmp(edit_state.TempTextBuffer.Data, buf) != 0)
+            // Will copy result string if modified
+            if (is_editable && strcmp(edit_state.TempBuffer.Data, buf) != 0)
            {
-                ImStrncpy(buf, edit_state.TempTextBuffer.Data, buf_size);
-                value_changed = true;
+                apply_new_text = edit_state.TempBuffer.Data;
+                apply_new_text_length = edit_state.CurLenA;
            }
        }
+
+        // Copy result to user buffer
+        if (apply_new_text)
+        {
+            IM_ASSERT(apply_new_text_length >= 0);
+            if (backup_current_text_length != apply_new_text_length && is_resizable)
+            {
+                ImGuiInputTextCallbackData callback_data;
+                callback_data.EventFlag = ImGuiInputTextFlags_CallbackResize;
+                callback_data.Flags = flags;
+                callback_data.Buf = buf;
+                callback_data.BufTextLen = apply_new_text_length;
+                callback_data.BufSize = ImMax(buf_size, apply_new_text_length + 1);
+                callback_data.UserData = callback_user_data;
+                callback(&callback_data);
+                buf = callback_data.Buf;
+                buf_size = callback_data.BufSize;
+                apply_new_text_length = ImMin(callback_data.BufTextLen, buf_size - 1);
+                IM_ASSERT(apply_new_text_length <= buf_size);
+            }
+
+            // If the underlying buffer resize was denied or not carried to the next frame, apply_new_text_length+1 may be >= buf_size.
+            ImStrncpy(buf, edit_state.TempBuffer.Data, ImMin(apply_new_text_length + 1, buf_size));
+            value_changed = true;
+        }
+
+        // Clear temporary user storage
+        edit_state.UserFlags = 0;
+        edit_state.UserCallback = NULL;
+        edit_state.UserCallbackData = NULL;
    }

    // Release active ID at the end of the function (so e.g. pressing Return still does a final application of the value)
@ -12113,7 +12202,12 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2

    // Render
    // Select which buffer we are going to display. When ImGuiInputTextFlags_NoLiveEdit is set 'buf' might still be the old value. We set buf to NULL to prevent accidental usage from now on.
-    const char* buf_display = (g.ActiveId == id && is_editable) ? edit_state.TempTextBuffer.Data : buf; buf = NULL;
+    const char* buf_display = (g.ActiveId == id && is_editable) ? edit_state.TempBuffer.Data : buf; buf = NULL;
+
+    // Set upper limit of single-line InputTextEx() at 2 million characters strings. The current pathological worst case is a long line
+    // without any carriage return, which would makes ImFont::RenderText() reserve too many vertices and probably crash. Avoid it altogether.
+    // Note that we only use this limit on single-line InputText(), so a pathologically large line on a InputTextMultiline() would still crash.
+    const int buf_display_max_length = 2 * 1024 * 1024;

    if (!is_multiline)
    {
@ -12124,7 +12218,7 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
    const ImVec4 clip_rect(frame_bb.Min.x, frame_bb.Min.y, frame_bb.Min.x + size.x, frame_bb.Min.y + size.y); // Not using frame_bb.Max because we have adjusted size
    ImVec2 render_pos = is_multiline ? draw_window->DC.CursorPos : frame_bb.Min + style.FramePadding;
    ImVec2 text_size(0.f, 0.f);
-    const bool is_currently_scrolling = (edit_state.Id == id && is_multiline && g.ActiveId == draw_window->GetIDNoKeepAlive("#SCROLLY"));
+    const bool is_currently_scrolling = (edit_state.ID == id && is_multiline && g.ActiveId == draw_window->GetIDNoKeepAlive("#SCROLLY"));
    if (g.ActiveId == id || is_currently_scrolling)
    {
        edit_state.CursorAnim += io.DeltaTime;
@ -12135,7 +12229,7 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
        // - Measure text height (for scrollbar)
        // We are attempting to do most of that in **one main pass** to minimize the computation cost (non-negligible for large amount of text) + 2nd pass for selection rendering (we could merge them by an extra refactoring effort)
        // FIXME: This should occur on buf_display but we'd need to maintain cursor/select_start/select_end for UTF-8.
-        const ImWchar* text_begin = edit_state.Text.Data;
+        const ImWchar* text_begin = edit_state.TextW.Data;
        ImVec2 cursor_offset, select_start_offset;

        {
@ -12248,7 +12342,9 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
            }
        }

-        draw_window->DrawList->AddText(g.Font, g.FontSize, render_pos - render_scroll, GetColorU32(ImGuiCol_Text), buf_display, buf_display + edit_state.CurLenA, 0.0f, is_multiline ? NULL : &clip_rect);
+        const int buf_display_len = edit_state.CurLenA;
+        if (is_multiline || buf_display_len < buf_display_max_length)
+            draw_window->DrawList->AddText(g.Font, g.FontSize, render_pos - render_scroll, GetColorU32(ImGuiCol_Text), buf_display, buf_display + buf_display_len, 0.0f, is_multiline ? NULL : &clip_rect);

        // Draw blinking cursor
        bool cursor_is_visible = (!g.IO.ConfigCursorBlink) || (g.InputTextState.CursorAnim <= 0.0f) || ImFmod(g.InputTextState.CursorAnim, 1.20f) <= 0.80f;
@ -12270,7 +12366,10 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
        const char* buf_end = NULL;
        if (is_multiline)
            text_size = ImVec2(size.x, InputTextCalcTextLenAndLineCount(buf_display, &buf_end) * g.FontSize); // We don't need width
-        draw_window->DrawList->AddText(g.Font, g.FontSize, render_pos, GetColorU32(ImGuiCol_Text), buf_display, buf_end, 0.0f, is_multiline ? NULL : &clip_rect);
+        else
+            buf_end = buf_display + strlen(buf_display);
+        if (is_multiline || (buf_end - buf_display) < buf_display_max_length)
+            draw_window->DrawList->AddText(g.Font, g.FontSize, render_pos, GetColorU32(ImGuiCol_Text), buf_display, buf_end, 0.0f, is_multiline ? NULL : &clip_rect);
    }

    if (is_multiline)
@ -12299,13 +12398,13 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
        return value_changed;
 }

-bool ImGui::InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags, ImGuiTextEditCallback callback, void* user_data)
+bool ImGui::InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
 {
    IM_ASSERT(!(flags & ImGuiInputTextFlags_Multiline)); // call InputTextMultiline()
    return InputTextEx(label, buf, (int)buf_size, ImVec2(0,0), flags, callback, user_data);
 }

-bool ImGui::InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size, ImGuiInputTextFlags flags, ImGuiTextEditCallback callback, void* user_data)
+bool ImGui::InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
 {
    return InputTextEx(label, buf, (int)buf_size, size, flags | ImGuiInputTextFlags_Multiline, callback, user_data);
 }
--- a/imgui.h
+++ b/imgui.h
@ -22,7 +22,9 @@
 #include <string.h>                 // memset, memmove, memcpy, strlen, strchr, strcpy, strcmp

 // Version
+// (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY00 then bounced up to XYY01 when release tagging happens)
 #define IMGUI_VERSION               "1.63 WIP"
+#define IMGUI_VERSION_NUM           16300 
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert))
 #define IMGUI_HAS_VIEWPORT          1 // Viewport WIP branch

@ -70,12 +72,12 @@ struct ImFontAtlas;                 // Runtime data for multiple fonts, bake mul
 struct ImFontConfig;                // Configuration data when adding a font or merging fonts
 struct ImColor;                     // Helper functions to create a color that can be converted to either u32 or float4 (*obsolete* please avoid using)
 struct ImGuiIO;                     // Main configuration and I/O between your application and ImGui
+struct ImGuiInputTextCallbackData;  // Shared state of ImGui::InputText() when using custom ImGuiInputTextCallback (rare/advanced use)
 struct ImGuiOnceUponAFrame;         // Simple helper for running a block of code not more than once a frame, used by IMGUI_ONCE_UPON_A_FRAME macro
 struct ImGuiStorage;                // Simple custom key value storage
 struct ImGuiStyle;                  // Runtime data for styling/colors
 struct ImGuiTextFilter;             // Parse and apply text filters. In format "aaaaa[,bbbb][,ccccc]"
 struct ImGuiTextBuffer;             // Text buffer for logging/accumulating text
-struct ImGuiTextEditCallbackData;   // Shared state of ImGui::InputText() when using custom ImGuiTextEditCallback (rare/advanced use)
 struct ImGuiSizeCallbackData;       // Structure used to constraint window size in custom ways when using custom ImGuiSizeCallback (rare/advanced use)
 struct ImGuiListClipper;            // Helper to manually clip large list of items
 struct ImGuiPayload;                // User data payload for drag and drop operations
@ -115,7 +117,7 @@ typedef int ImGuiSelectableFlags;   // flags: for Selectable()
 typedef int ImGuiTreeNodeFlags;     // flags: for TreeNode*(),CollapsingHeader()// enum ImGuiTreeNodeFlags_
 typedef int ImGuiViewportFlags;     // flags: for ImGuiViewport                 // enum ImGuiViewportFlags_ 
 typedef int ImGuiWindowFlags;       // flags: for Begin*()                      // enum ImGuiWindowFlags_
-typedef int (*ImGuiTextEditCallback)(ImGuiTextEditCallbackData *data);
+typedef int (*ImGuiInputTextCallback)(ImGuiInputTextCallbackData *data);
 typedef void (*ImGuiSizeCallback)(ImGuiSizeCallbackData* data);

 // Scalar data types
@ -185,7 +187,7 @@ namespace ImGui
    IMGUI_API bool          ShowStyleSelector(const char* label);       // add style selector block (not a window), essentially a combo listing the default styles.
    IMGUI_API void          ShowFontSelector(const char* label);        // add font selector block (not a window), essentially a combo listing the loaded fonts.
    IMGUI_API void          ShowUserGuide();                            // add basic help/info block (not a window): how to manipulate ImGui as a end-user (mouse/keyboard controls).
-    IMGUI_API const char*   GetVersion();                               // get a version string e.g. "1.23"
+    IMGUI_API const char*   GetVersion();                               // get the compiled version string e.g. "1.23"

    // Styles
    IMGUI_API void          StyleColorsDark(ImGuiStyle* dst = NULL);    // new, recommended style (default)
@ -380,8 +382,9 @@ namespace ImGui
    IMGUI_API bool          DragScalarN(const char* label, ImGuiDataType data_type, void* v, int components, float v_speed, const void* v_min = NULL, const void* v_max = NULL, const char* format = NULL, float power = 1.0f);

    // Widgets: Input with Keyboard
-    IMGUI_API bool          InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiTextEditCallback callback = NULL, void* user_data = NULL);
-    IMGUI_API bool          InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size = ImVec2(0,0), ImGuiInputTextFlags flags = 0, ImGuiTextEditCallback callback = NULL, void* user_data = NULL);
+    // If you want to use InputText() with a dynamic string type such as std::string or your own, see misc/stl/imgui_stl.h
+    IMGUI_API bool          InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+    IMGUI_API bool          InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size = ImVec2(0,0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
    IMGUI_API bool          InputFloat(const char* label, float* v, float step = 0.0f, float step_fast = 0.0f, const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
    IMGUI_API bool          InputFloat2(const char* label, float v[2], const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
    IMGUI_API bool          InputFloat3(const char* label, float v[3], const char* format = "%.3f", ImGuiInputTextFlags extra_flags = 0);
@ -659,7 +662,7 @@ enum ImGuiInputTextFlags_
    ImGuiInputTextFlags_CallbackCompletion  = 1 << 6,   // Call user function on pressing TAB (for completion handling)
    ImGuiInputTextFlags_CallbackHistory     = 1 << 7,   // Call user function on pressing Up/Down arrows (for history handling)
    ImGuiInputTextFlags_CallbackAlways      = 1 << 8,   // Call user function every time. User code may query cursor position, modify text buffer.
-    ImGuiInputTextFlags_CallbackCharFilter  = 1 << 9,   // Call user function to filter character. Modify data->EventChar to replace/filter input, or return 1 to discard character.
+    ImGuiInputTextFlags_CallbackCharFilter  = 1 << 9,   // Call user function to filter character. Modify data->EventChar to replace/filter input, or return 1 in callback to discard character.
    ImGuiInputTextFlags_AllowTabInput       = 1 << 10,  // Pressing TAB input a '\t' character into the text field
    ImGuiInputTextFlags_CtrlEnterForNewLine = 1 << 11,  // In multi-line mode, unfocus with Enter, add new line with Ctrl+Enter (default is opposite: unfocus with Ctrl+Enter, add line with Enter).
    ImGuiInputTextFlags_NoHorizontalScroll  = 1 << 12,  // Disable following the cursor horizontally
@ -668,6 +671,7 @@ enum ImGuiInputTextFlags_
    ImGuiInputTextFlags_Password            = 1 << 15,  // Password mode, display all characters as '*'
    ImGuiInputTextFlags_NoUndoRedo          = 1 << 16,  // Disable undo/redo. Note that input text owns the text data while active, if you want to provide your own undo/redo stack you need e.g. to call ClearActiveID().
    ImGuiInputTextFlags_CharsScientific     = 1 << 17,  // Allow 0123456789.+-*/eE (Scientific notation input)
+    ImGuiInputTextFlags_CallbackResize      = 1 << 18,  // Allow buffer capacity resize + notify when the string wants to be resized (for string types which hold a cache of their Size) (see misc/stl/imgui_stl.h for an example of using this)
    // [Internal]
    ImGuiInputTextFlags_Multiline           = 1 << 20   // For internal use by InputTextMultiline()
 };
@ -1138,12 +1142,12 @@ struct ImGuiIO
    void*       ClipboardUserData;

 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    // [OBSOLETE] Rendering function, will be automatically called in Render(). Please call your rendering function yourself now!
+    // [OBSOLETE since 1.60+] Rendering function, will be automatically called in Render(). Please call your rendering function yourself now!
    // You can obtain the ImDrawData* by calling ImGui::GetDrawData() after Render(). See example applications if you are unsure of how to implement this.
    void        (*RenderDrawListsFn)(ImDrawData* data);
 #else
    // This is only here to keep ImGuiIO the same size, so that IMGUI_DISABLE_OBSOLETE_FUNCTIONS can exceptionally be used outside of imconfig.h.
-    void*       RenderDrawListsFnDummy;
+    void*       RenderDrawListsFnUnused;
 #endif

    //------------------------------------------------------------------
@ -1436,34 +1440,43 @@ struct ImGuiStorage
    IMGUI_API void      BuildSortByKey();
 };

-// Shared state of InputText(), passed to callback when a ImGuiInputTextFlags_Callback* flag is used and the corresponding callback is triggered.
-struct ImGuiTextEditCallbackData
+// Shared state of InputText(), passed as an argument to your callback when a ImGuiInputTextFlags_Callback* flag is used.
+// The callback function should return 0 by default.
+// Special processing:
+// - ImGuiInputTextFlags_CallbackCharFilter:  return 1 if the character is not allowed. You may also set 'EventChar=0' as any character replacement are allowed.
+// - ImGuiInputTextFlags_CallbackResize:      notified by InputText() when the string is resized. BufTextLen is set to the new desired string length so you can update the string size on your side of the fence. You can also replace Buf pointer if your underlying data is reallocated. No need to initialize new characters or zero-terminator as InputText will do it right after the resize callback.
+struct ImGuiInputTextCallbackData
 {
-    ImGuiInputTextFlags EventFlag;      // One of ImGuiInputTextFlags_Callback* // Read-only
+    ImGuiInputTextFlags EventFlag;      // One ImGuiInputTextFlags_Callback*    // Read-only
    ImGuiInputTextFlags Flags;          // What user passed to InputText()      // Read-only
    void*               UserData;       // What user passed to InputText()      // Read-only
-    bool                ReadOnly;       // Read-only mode                       // Read-only

-    // CharFilter event:
-    ImWchar             EventChar;      // Character input                      // Read-write (replace character or set to zero)
+    // Arguments for the different callback events
+    // - To modify the text buffer in a callback, prefer using the InsertChars() / DeleteChars() function. InsertChars() will take care of calling the resize callback if necessary.
+    // - If you know your edits are not going to resize the underlying buffer allocation, you may modify the contents of 'Buf[]' directly. You need to update 'BufTextLen' accordingly (0 <= BufTextLen < BufSize) and set 'BufDirty'' to true so InputText can update its internal state.
+    ImWchar             EventChar;      // Character input                      // Read-write   // [CharFilter] Replace character or set to zero. return 1 is equivalent to setting EventChar=0;
+    ImGuiKey            EventKey;       // Key pressed (Up/Down/TAB)            // Read-only    // [Completion,History]
+    char*               Buf;            // Text buffer                          // Read-write   // [Resize] Can replace pointer / [Completion,History,Always] Only write to pointed data, don't replace the actual pointer!
+    int                 BufTextLen;     // Text length in bytes                 // Read-write   // [Resize,Completion,History,Always] Exclude zero-terminator storage. In C land: == strlen(some_text), in C++ land: string.length()
+    int                 BufSize;        // Buffer capacity in bytes             // Read-only    // [Resize,Completion,History,Always] Include zero-terminator storage. In C land == ARRAYSIZE(my_char_array), in C++ land: string.capacity()+1
+    bool                BufDirty;       // Set if you modify Buf/BufTextLen!!   // Write        // [Completion,History,Always]
+    int                 CursorPos;      //                                      // Read-write   // [Completion,History,Always]
+    int                 SelectionStart; //                                      // Read-write   // [Completion,History,Always] == to SelectionEnd when no selection)
+    int                 SelectionEnd;   //                                      // Read-write   // [Completion,History,Always]

-    // Completion,History,Always events:
-    // If you modify the buffer contents make sure you update 'BufTextLen' and set 'BufDirty' to true.
-    ImGuiKey            EventKey;       // Key pressed (Up/Down/TAB)            // Read-only
-    char*               Buf;            // Current text buffer                  // Read-write (pointed data only, can't replace the actual pointer)
-    int                 BufTextLen;     // Current text length in bytes         // Read-write
-    int                 BufSize;        // Maximum text length in bytes         // Read-only
-    bool                BufDirty;       // Set if you modify Buf/BufTextLen!!   // Write
-    int                 CursorPos;      //                                      // Read-write
-    int                 SelectionStart; //                                      // Read-write (== to SelectionEnd when no selection)
-    int                 SelectionEnd;   //                                      // Read-write
-
-    // NB: Helper functions for text manipulation. Calling those function loses selection.
-    IMGUI_API void    DeleteChars(int pos, int bytes_count);
-    IMGUI_API void    InsertChars(int pos, const char* text, const char* text_end = NULL);
-    bool              HasSelection() const { return SelectionStart != SelectionEnd; }
+    // Helper functions for text manipulation.
+    // Use those function to benefit from the CallbackResize behaviors. Calling those function reset the selection.
+    ImGuiInputTextCallbackData();
+    IMGUI_API void      DeleteChars(int pos, int bytes_count);
+    IMGUI_API void      InsertChars(int pos, const char* text, const char* text_end = NULL);
+    bool                HasSelection() const { return SelectionStart != SelectionEnd; }
 };

+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+typedef ImGuiInputTextCallback      ImGuiTextEditCallback;      // [OBSOLETE 1.63+] Made the names consistent
+typedef ImGuiInputTextCallbackData  ImGuiTextEditCallbackData;
+#endif
+
 // Resizing callback data to apply custom constraint. As enabled by SetNextWindowSizeConstraints(). Callback is called during the next Begin().
 // NB: For basic min/max size constraint on each axis you don't need to use the callback! The SetNextWindowSizeConstraints() parameters are enough.
 struct ImGuiSizeCallbackData
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@ -36,7 +36,6 @@

 #ifdef _MSC_VER
 #pragma warning (disable: 4996) // 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen
-#define snprintf  _snprintf
 #define vsnprintf _vsnprintf
 #endif
 #ifdef __clang__
@ -355,7 +354,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
                static char str0[128] = "Hello, world!";
                static int i0 = 123;
                ImGui::InputText("input text", str0, IM_ARRAYSIZE(str0));
-                ImGui::SameLine(); ShowHelpMarker("Hold SHIFT or use mouse to select text.\n" "CTRL+Left/Right to word jump.\n" "CTRL+A or double-click to select all.\n" "CTRL+X,CTRL+C,CTRL+V clipboard.\n" "CTRL+Z,CTRL+Y undo/redo.\n" "ESCAPE to revert.\n");
+                ImGui::SameLine(); ShowHelpMarker("USER:\nHold SHIFT or use mouse to select text.\n" "CTRL+Left/Right to word jump.\n" "CTRL+A or double-click to select all.\n" "CTRL+X,CTRL+C,CTRL+V clipboard.\n" "CTRL+Z,CTRL+Y undo/redo.\n" "ESCAPE to revert.\n\nPROGRAMMER:\nYou can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputText() to a dynamic string type. See misc/stl/imgui_stl.h for an example (this is not demonstrated in imgui_demo.cpp).");

                ImGui::InputInt("input int", &i0);
                ImGui::SameLine(); ShowHelpMarker("You can apply arithmetic operators +,*,/ on numerical values.\n  e.g. [ 100 ], input \'*2\', result becomes [ 200 ]\nUse +- to subtract.\n");
@ -775,7 +774,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
            static char buf3[64] = ""; ImGui::InputText("hexadecimal", buf3, 64, ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_CharsUppercase);
            static char buf4[64] = ""; ImGui::InputText("uppercase", buf4, 64, ImGuiInputTextFlags_CharsUppercase);
            static char buf5[64] = ""; ImGui::InputText("no blank", buf5, 64, ImGuiInputTextFlags_CharsNoBlank);
-            struct TextFilters { static int FilterImGuiLetters(ImGuiTextEditCallbackData* data) { if (data->EventChar < 256 && strchr("imgui", (char)data->EventChar)) return 0; return 1; } };
+            struct TextFilters { static int FilterImGuiLetters(ImGuiInputTextCallbackData* data) { if (data->EventChar < 256 && strchr("imgui", (char)data->EventChar)) return 0; return 1; } };
            static char buf6[64] = ""; ImGui::InputText("\"imgui\" letters", buf6, 64, ImGuiInputTextFlags_CallbackCharFilter, TextFilters::FilterImGuiLetters);

            ImGui::Text("Password input");
@ -802,10 +801,10 @@ void ImGui::ShowDemoWindow(bool* p_open)
                "label:\n"
                "\tlock cmpxchg8b eax\n";

-            ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0,0));
+            ShowHelpMarker("You can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputTextMultiline() to a dynamic string type. See misc/stl/imgui_stl.h for an example. (This is not demonstrated in imgui_demo.cpp)");
            ImGui::Checkbox("Read-only", &read_only);
-            ImGui::PopStyleVar();
-            ImGui::InputTextMultiline("##source", text, IM_ARRAYSIZE(text), ImVec2(-1.0f, ImGui::GetTextLineHeight() * 16), ImGuiInputTextFlags_AllowTabInput | (read_only ? ImGuiInputTextFlags_ReadOnly : 0));
+            ImGuiInputTextFlags flags = ImGuiInputTextFlags_AllowTabInput | (read_only ? ImGuiInputTextFlags_ReadOnly : 0);
+            ImGui::InputTextMultiline("##source", text, IM_ARRAYSIZE(text), ImVec2(-1.0f, ImGui::GetTextLineHeight() * 16), flags);
            ImGui::TreePop();
        }

@ -2810,14 +2809,15 @@ struct ExampleAppConsole
        bool reclaim_focus = false;
        if (ImGui::InputText("Input", InputBuf, IM_ARRAYSIZE(InputBuf), ImGuiInputTextFlags_EnterReturnsTrue|ImGuiInputTextFlags_CallbackCompletion|ImGuiInputTextFlags_CallbackHistory, &TextEditCallbackStub, (void*)this))
        {
-            Strtrim(InputBuf);
-            if (InputBuf[0])
-                ExecCommand(InputBuf);
-            strcpy(InputBuf, "");
+            char* s = InputBuf;
+            Strtrim(s);
+            if (s[0])
+                ExecCommand(s);
+            strcpy(s, "");
            reclaim_focus = true;
        }

-        // Demonstrate keeping focus on the input box
+        // Auto-focus on window apparition
        ImGui::SetItemDefaultFocus();
        if (reclaim_focus)
            ImGui::SetKeyboardFocusHere(-1); // Auto focus previous widget
@ -2863,13 +2863,13 @@ struct ExampleAppConsole
        }
    }

-    static int TextEditCallbackStub(ImGuiTextEditCallbackData* data) // In C++11 you are better off using lambdas for this sort of forwarding callbacks
+    static int TextEditCallbackStub(ImGuiInputTextCallbackData* data) // In C++11 you are better off using lambdas for this sort of forwarding callbacks
    {
        ExampleAppConsole* console = (ExampleAppConsole*)data->UserData;
        return console->TextEditCallback(data);
    }

-    int     TextEditCallback(ImGuiTextEditCallbackData* data)
+    int     TextEditCallback(ImGuiInputTextCallbackData* data)
    {
        //AddLog("cursor: %d, selection: %d-%d", data->CursorPos, data->SelectionStart, data->SelectionEnd);
        switch (data->EventFlag)
@ -2960,8 +2960,9 @@ struct ExampleAppConsole
                // A better implementation would preserve the data on the current input line along with cursor position.
                if (prev_history_pos != HistoryPos)
                {
-                    data->CursorPos = data->SelectionStart = data->SelectionEnd = data->BufTextLen = (int)snprintf(data->Buf, (size_t)data->BufSize, "%s", (HistoryPos >= 0) ? History[HistoryPos] : "");
-                    data->BufDirty = true;
+                    const char* history_str = (HistoryPos >= 0) ? History[HistoryPos] : "";
+                    data->DeleteChars(0, data->BufTextLen);
+                    data->InsertChars(0, history_str);
                }
            }
        }
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@ -2632,11 +2632,32 @@ void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col
    const bool word_wrap_enabled = (wrap_width > 0.0f);
    const char* word_wrap_eol = NULL;

-    // Skip non-visible lines
+    // Fast-forward to first visible line
    const char* s = text_begin;
-    if (!word_wrap_enabled && y + line_height < clip_rect.y)
-        while (s < text_end && *s != '\n')  // Fast-forward to next line
-            s++;
+    if (y + line_height < clip_rect.y && !word_wrap_enabled)
+        while (y + line_height < clip_rect.y)
+        {
+            while (s < text_end)
+                if (*s++ == '\n')
+                    break;
+            y += line_height;
+        }
+
+    // For large text, scan for the last visible line in order to avoid over-reserving in the call to PrimReserve()
+    // Note that very large horizontal line will still be affected by the issue (e.g. a one megabyte string buffer without a newline will likely crash atm)
+    if (text_end - s > 10000 && !word_wrap_enabled)
+    {
+        const char* s_end = s;
+        float y_end = y;
+        while (y_end < clip_rect.w)
+        {
+            while (s_end < text_end)
+                if (*s_end++ == '\n')
+                    break;
+            y_end += line_height;
+        }
+        text_end = s_end;
+    }

    // Reserve vertices for remaining worse case (over-reserving is useful and easily amortized)
    const int vtx_count_max = (int)(text_end - s) * 4;
@ -2695,12 +2716,8 @@ void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col
            {
                x = pos.x;
                y += line_height;
-
                if (y > clip_rect.w)
-                    break;
-                if (!word_wrap_enabled && y + line_height < clip_rect.y)
-                    while (s < text_end && *s != '\n')  // Fast-forward to next line
-                        s++;
+                    break; // break out of main loop
                continue;
            }
            if (c == '\r')
--- a/imgui_internal.h
+++ b/imgui_internal.h
@ -41,6 +41,7 @@ struct ImGuiColumnData;             // Storage data for a single column
 struct ImGuiColumnsSet;             // Storage data for a columns set
 struct ImGuiContext;                // Main imgui context
 struct ImGuiGroupData;              // Stacked storage data for BeginGroup()/EndGroup()
+struct ImGuiInputTextState;         // Internal state of the currently focused/edited text input box
 struct ImGuiItemHoveredDataBackup;  // Backup and restore IsItemHovered() internal data
 struct ImGuiMenuColumns;            // Simple column measurement, currently used for MenuItem() only
 struct ImGuiNavMoveResult;          // Result of a directional navigation move query result
@ -48,7 +49,6 @@ struct ImGuiNextWindowData;         // Storage for SetNexWindow** functions
 struct ImGuiPopupRef;               // Storage for current popup stack
 struct ImGuiSettingsHandler;
 struct ImGuiStyleMod;               // Stacked style modifier, backup of modified data so we can restore it
-struct ImGuiTextEditState;          // Internal state of the currently focused/edited text input box
 struct ImGuiWindow;                 // Storage for one window
 struct ImGuiWindowTempData;         // Temporary storage for one, that's the data which in theory we could ditch at the end of the frame
 struct ImGuiWindowSettings;         // Storage for window settings stored in .ini file (we keep one of those even if the actual window wasn't instanced during this session)
@ -72,7 +72,7 @@ namespace ImGuiStb

 #undef STB_TEXTEDIT_STRING
 #undef STB_TEXTEDIT_CHARTYPE
-#define STB_TEXTEDIT_STRING             ImGuiTextEditState
+#define STB_TEXTEDIT_STRING             ImGuiInputTextState
 #define STB_TEXTEDIT_CHARTYPE           ImWchar
 #define STB_TEXTEDIT_GETWIDTH_NEWLINE   -1.0f
 #include "stb_textedit.h"
@ -430,27 +430,32 @@ struct IMGUI_API ImGuiMenuColumns
 };

 // Internal state of the currently focused/edited text input box
-struct IMGUI_API ImGuiTextEditState
+struct IMGUI_API ImGuiInputTextState
 {
-    ImGuiID             Id;                         // widget id owning the text state
-    ImVector<ImWchar>   Text;                       // edit buffer, we need to persist but can't guarantee the persistence of the user-provided buffer. so we copy into own buffer.
-    ImVector<char>      InitialText;                // backup of end-user buffer at the time of focus (in UTF-8, unaltered)
-    ImVector<char>      TempTextBuffer;
-    int                 CurLenA, CurLenW;           // we need to maintain our buffer length in both UTF-8 and wchar format.
-    int                 BufSizeA;                   // end-user buffer size
-    float               ScrollX;
-    ImGuiStb::STB_TexteditState   StbState;
-    float               CursorAnim;
-    bool                CursorFollow;
-    bool                SelectedAllMouseLock;
+    ImGuiID                 ID;                     // widget id owning the text state
+    ImVector<ImWchar>       TextW;                  // edit buffer, we need to persist but can't guarantee the persistence of the user-provided buffer. so we copy into own buffer.
+    ImVector<char>          InitialText;            // backup of end-user buffer at the time of focus (in UTF-8, unaltered)
+    ImVector<char>          TempBuffer;             // temporary buffer for callback and other other operations. size=capacity.
+    int                     CurLenA, CurLenW;       // we need to maintain our buffer length in both UTF-8 and wchar format.
+    int                     BufCapacityA;           // end-user buffer capacity
+    float                   ScrollX;
+    ImGuiStb::STB_TexteditState StbState;
+    float                   CursorAnim;
+    bool                    CursorFollow;
+    bool                    SelectedAllMouseLock;

-    ImGuiTextEditState()                            { memset(this, 0, sizeof(*this)); }
+    // Temporarily set when active
+    ImGuiInputTextFlags     UserFlags;
+    ImGuiInputTextCallback  UserCallback;
+    void*                   UserCallbackData;
+
+    ImGuiInputTextState()                           { memset(this, 0, sizeof(*this)); }
    void                CursorAnimReset()           { CursorAnim = -0.30f; }                                   // After a user-input the cursor stays on for a while without blinking
    void                CursorClamp()               { StbState.cursor = ImMin(StbState.cursor, CurLenW); StbState.select_start = ImMin(StbState.select_start, CurLenW); StbState.select_end = ImMin(StbState.select_end, CurLenW); }
    bool                HasSelection() const        { return StbState.select_start != StbState.select_end; }
    void                ClearSelection()            { StbState.select_start = StbState.select_end = StbState.cursor; }
    void                SelectAll()                 { StbState.select_start = 0; StbState.cursor = StbState.select_end = CurLenW; StbState.has_preferred_x = false; }
-    void                OnKeyPressed(int key);
+    void                OnKeyPressed(int key);      // Cannot be inline because we call in code in stb_textedit.h implementation
 };

 // Windows data saved in imgui.ini file
@ -771,7 +776,7 @@ struct ImGuiContext
    unsigned char           DragDropPayloadBufLocal[8];         // Local buffer for small payloads

    // Widget state
-    ImGuiTextEditState      InputTextState;
+    ImGuiInputTextState     InputTextState;
    ImFont                  InputTextPasswordFont;
    ImGuiID                 ScalarAsInputTextId;                // Temporary text input when CTRL+clicking on a slider, etc.
    ImGuiColorEditFlags     ColorEditOptions;                   // Store user options for color edit widgets
@ -1265,13 +1270,13 @@ namespace ImGui
    // Widgets low-level behaviors
    IMGUI_API bool          ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool* out_held, ImGuiButtonFlags flags = 0);
    IMGUI_API bool          DragBehavior(ImGuiID id, ImGuiDataType data_type, void* v, float v_speed, const void* v_min, const void* v_max, const char* format, float power);
-    IMGUI_API bool          SliderBehavior(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, void* v, const void* v_min, const void* v_max, const char* format, float power, ImGuiSliderFlags flags = 0);
+    IMGUI_API bool          SliderBehavior(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, void* v, const void* v_min, const void* v_max, const char* format, float power, ImGuiSliderFlags flags, ImRect* out_grab_bb);
    IMGUI_API bool          SplitterBehavior(const ImRect& bb, ImGuiID id, ImGuiAxis axis, float* size1, float* size2, float min_size1, float min_size2, float hover_extend = 0.0f, float hover_visibility_delay = 0.0f);
    IMGUI_API bool          TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* label, const char* label_end = NULL);
    IMGUI_API bool          TreeNodeBehaviorIsOpen(ImGuiID id, ImGuiTreeNodeFlags flags = 0);                     // Consume previous SetNextTreeNodeOpened() data, if any. May return true when logging
    IMGUI_API void          TreePushRawID(ImGuiID id);

-    IMGUI_API bool          InputTextEx(const char* label, char* buf, int buf_size, const ImVec2& size_arg, ImGuiInputTextFlags flags, ImGuiTextEditCallback callback = NULL, void* user_data = NULL);
+    IMGUI_API bool          InputTextEx(const char* label, char* buf, int buf_size, const ImVec2& size_arg, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
    IMGUI_API bool          InputScalarAsWidgetReplacement(const ImRect& bb, ImGuiID id, const char* label, ImGuiDataType data_type, void* data_ptr, const char* format);

    IMGUI_API void          ColorTooltip(const char* text, const float* col, ImGuiColorEditFlags flags);
--- a/misc/stl/imgui_stl.cpp
+++ b/misc/stl/imgui_stl.cpp
@ -0,0 +1,57 @@
+// imgui_stl.cpp
+// Wrappers for STL types (std::string, etc.)
+// This is also an example of how you may wrap your own similar types.
+
+#include "imgui.h"
+#include "imgui_stl.h"
+
+struct InputTextCallback_UserData
+{
+    std::string*            Str;
+    ImGuiInputTextCallback  ChainCallback;
+    void*                   ChainCallbackUserData;
+};
+
+static int InputTextCallback(ImGuiInputTextCallbackData* data)
+{
+    InputTextCallback_UserData* user_data = (InputTextCallback_UserData*)data->UserData;
+    if (data->EventFlag == ImGuiInputTextFlags_CallbackResize)
+    {
+        // Resize string callback
+        std::string* str = user_data->Str;
+        IM_ASSERT(data->Buf == str->c_str());
+        str->resize(data->BufTextLen);
+        data->Buf = (char*)str->c_str();
+    }
+    else if (user_data->ChainCallback)
+    {
+        // Forward to user callback, if any
+        data->UserData = user_data->ChainCallbackUserData;
+        return user_data->ChainCallback(data);
+    }
+    return 0;
+}
+
+bool ImGui::InputText(const char* label, std::string* str, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
+{
+    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
+    flags |= ImGuiInputTextFlags_CallbackResize;
+
+    InputTextCallback_UserData cb_user_data;
+    cb_user_data.Str = str;
+    cb_user_data.ChainCallback = callback;
+    cb_user_data.ChainCallbackUserData = user_data;
+    return InputText(label, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
+}
+
+bool ImGui::InputTextMultiline(const char* label, std::string* str, const ImVec2& size, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
+{
+    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
+    flags |= ImGuiInputTextFlags_CallbackResize;
+
+    InputTextCallback_UserData cb_user_data;
+    cb_user_data.Str = str;
+    cb_user_data.ChainCallback = callback;
+    cb_user_data.ChainCallbackUserData = user_data;
+    return InputTextMultiline(label, (char*)str->c_str(), str->capacity() + 1, size, flags, InputTextCallback, &cb_user_data);
+}
--- a/misc/stl/imgui_stl.h
+++ b/misc/stl/imgui_stl.h
@ -0,0 +1,18 @@
+// imgui_stl.h
+// Wrappers for STL types (std::string, etc.)
+// This is also an example of how you may wrap your own similar types.
+
+// Changelog:
+// - v0.10: Initial version. Added InputText() / InputTextMultiline() calls with std::string
+
+#pragma once
+
+#include <string>
+
+namespace ImGui
+{
+    // ImGui::InputText() with std::string
+    // Because text input needs dynamic resizing, we need to setup a callback to grow the capacity
+    IMGUI_API bool  InputText(const char* label, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+    IMGUI_API bool  InputTextMultiline(const char* label, std::string* str, const ImVec2& size = ImVec2(0, 0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+}