Merge branch 'master' into docking

# Conflicts:
#	backends/imgui_impl_dx12.cpp

.gitignore

@@ -34,7 +34,7 @@ xcuserdata
 examples/*.o.tmp
 examples/*.out.js
 examples/*.out.wasm
-examples/example_emscripten_opengl3/example_emscripten_opengl3.*
+examples/example_emscripten_opengl3/web/*
 
 ## JetBrains IDE artifacts
 .idea

backends/imgui_impl_dx10.cpp

@@ -12,7 +12,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2019-07-21: DirectX10: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData().
 //  2019-05-29: DirectX10: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: DirectX10: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.

backends/imgui_impl_dx11.cpp

@@ -12,7 +12,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2019-08-01: DirectX11: Fixed code querying the Geometry Shader state (would generally error with Debug layer enabled).
 //  2019-07-21: DirectX11: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData. Clearing Hull/Domain/Compute shaders without backup/restore.
 //  2019-05-29: DirectX11: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.

backends/imgui_impl_dx12.cpp

@@ -17,7 +17,8 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-01-11: DirectX12: Improve Windows 7 compatibility (for D3D12On7) by loading d3d12.dll dynamically.
 //  2020-09-16: DirectX12: Avoid rendering calls with zero-sized scissor rectangle since it generates a validation layer warning.
 //  2020-09-08: DirectX12: Clarified support for building on 32-bit systems by redefining ImTextureID.
 //  2019-10-18: DirectX12: *BREAKING CHANGE* Added extra ID3D12DescriptorHeap parameter to ImGui_ImplDX12_Init() function.
@@ -536,8 +537,34 @@ bool    ImGui_ImplDX12_CreateDeviceObjects()
             D3D12_ROOT_SIGNATURE_FLAG_DENY_DOMAIN_SHADER_ROOT_ACCESS |
             D3D12_ROOT_SIGNATURE_FLAG_DENY_GEOMETRY_SHADER_ROOT_ACCESS;
 
+        // Load d3d12.dll and D3D12SerializeRootSignature() function address dynamically to facilitate using with D3D12On7.
+        // See if any version of d3d12.dll is already loaded in the process. If so, give preference to that.
+        static HINSTANCE d3d12_dll = ::GetModuleHandleA("d3d12.dll");
+        if (d3d12_dll == NULL)
+        {
+            // Attempt to load d3d12.dll from local directories. This will only succeed if
+            // (1) the current OS is Windows 7, and
+            // (2) there exists a version of d3d12.dll for Windows 7 (D3D12On7) in one of the following directories.
+            // See https://github.com/ocornut/imgui/pull/3696 for details.
+            const char* localD3d12Paths[] = { ".\\d3d12.dll", ".\\d3d12on7\\d3d12.dll", ".\\12on7\\d3d12.dll" }; // A. current directory, B. used by some games, C. used in Microsoft D3D12On7 sample
+            for (int i = 0; i < IM_ARRAYSIZE(localD3d12Paths); i++)
+                if ((d3d12_dll = ::LoadLibraryA(localD3d12Paths[i])) != NULL)
+                    break;
+
+            // If failed, we are on Windows >= 10.
+            if (d3d12_dll == NULL)
+                d3d12_dll = ::LoadLibraryA("d3d12.dll");
+
+            if (d3d12_dll == NULL)
+                return false;
+        }
+
+        PFN_D3D12_SERIALIZE_ROOT_SIGNATURE D3D12SerializeRootSignatureFn = (PFN_D3D12_SERIALIZE_ROOT_SIGNATURE)::GetProcAddress(d3d12_dll, "D3D12SerializeRootSignature");
+        if (D3D12SerializeRootSignatureFn == NULL)
+            return false;
+
         ID3DBlob* blob = NULL;
-        if (D3D12SerializeRootSignature(&desc, D3D_ROOT_SIGNATURE_VERSION_1, &blob, NULL) != S_OK)
+        if (D3D12SerializeRootSignatureFn(&desc, D3D_ROOT_SIGNATURE_VERSION_1, &blob, NULL) != S_OK)
             return false;
 
         g_pd3dDevice->CreateRootSignature(0, blob->GetBufferPointer(), blob->GetBufferSize(), IID_PPV_ARGS(&g_pRootSignature));

backends/imgui_impl_dx12.h

@@ -17,6 +17,11 @@
 #pragma once
 #include "imgui.h"      // IMGUI_IMPL_API
 
+#ifdef _MSC_VER
+#pragma warning (push)
+#pragma warning (disable: 4471) // a forward declaration of an unscoped enumeration must have an underlying type
+#endif
+
 enum DXGI_FORMAT;
 struct ID3D12Device;
 struct ID3D12DescriptorHeap;
@@ -37,3 +42,8 @@ IMGUI_IMPL_API void     ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3
 // Use if you want to reset your rendering device without losing Dear ImGui state.
 IMGUI_IMPL_API void     ImGui_ImplDX12_InvalidateDeviceObjects();
 IMGUI_IMPL_API bool     ImGui_ImplDX12_CreateDeviceObjects();
+
+#ifdef _MSC_VER
+#pragma warning (pop)
+#endif
+

backends/imgui_impl_dx9.cpp

@@ -12,7 +12,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2019-05-29: DirectX9: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: DirectX9: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 //  2019-03-29: Misc: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects().

backends/imgui_impl_glfw.cpp

@@ -19,7 +19,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2020-01-17: Inputs: Disable error callback while assigning mouse cursors because some X11 setup don't have them and it generates errors.
 //  2019-12-05: Inputs: Added support for new mouse cursors added in GLFW 3.4+ (resizing cursors, not allowed cursor).
 //  2019-10-18: Misc: Previously installed user callbacks are now restored on shutdown.

backends/imgui_impl_opengl2.cpp

@@ -19,7 +19,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2021-01-03: OpenGL: Backup, setup and restore GL_SHADE_MODEL state, disable GL_STENCIL_TEST and disable GL_NORMAL_ARRAY client state to increase compatibility with legacy OpenGL applications.
 //  2020-01-23: OpenGL: Backup, setup and restore GL_TEXTURE_ENV to increase compatibility with legacy OpenGL applications.
 //  2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.

backends/imgui_impl_opengl3.cpp

@@ -14,7 +14,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2021-01-03: OpenGL: Backup, setup and restore GL_STENCIL_TEST state.
 //  2020-10-23: OpenGL: Backup, setup and restore GL_PRIMITIVE_RESTART state.
 //  2020-10-15: OpenGL: Use glGetString(GL_VERSION) instead of glGetIntegerv(GL_MAJOR_VERSION, ...) when the later returns zero (e.g. Desktop GL 2.x)

backends/imgui_impl_sdl.cpp

@@ -19,7 +19,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2020-05-25: Misc: Report a zero display-size when window is minimized, to be consistent with other backends.
 //  2020-02-20: Inputs: Fixed mapping for ImGuiKey_KeyPadEnter (using SDL_SCANCODE_KP_ENTER instead of SDL_SCANCODE_RETURN2).
 //  2019-12-17: Inputs: On Wayland, use SDL_GetMouseState (because there is no global mouse state).

backends/imgui_impl_win32.cpp

@@ -33,7 +33,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2020-12-04: Misc: Fixed setting of io.DisplaySize to invalid/uninitialized data when after hwnd has been closed.
 //  2020-03-03: Inputs: Calling AddInputCharacterUTF16() to support surrogate pairs leading to codepoint >= 0x10000 (for more complete CJK inputs)
 //  2020-02-17: Added ImGui_ImplWin32_EnableDpiAwareness(), ImGui_ImplWin32_GetDpiScaleForHwnd(), ImGui_ImplWin32_GetDpiScaleForMonitor() helper functions.

docs/CHANGELOG.txt

@@ -143,7 +143,7 @@ Other Changes:
                         TableGetColumnCount(), TableGetColumnName(), TableGetColumnFlags().
   - Added 2 structures: ImGuiTableSortSpecs, ImGuiTableColumnSortSpecs.
   - Added 2 enums:      ImGuiSortDirection, ImGuiTableBgTarget.
-  - Added 3 flags sets: ImGuiTableFlags (27 flags), ImGuiTableColumnFlags (24 flags), ImGuiTableRowFlags (1 flags).
+  - Added 3 flags sets: ImGuiTableFlags (27 flags), ImGuiTableColumnFlags (24 flags), ImGuiTableRowFlags (1 flag).
   - Added 5 colors:     ImGuiCol_TableHeaderBg, ImGuiCol_TableBorderStrong, ImGuiCol_TableBorderLight, ImGuiCol_TableRowBg, ImGuiCol_TableRowBgAlt.
   - Added 1 style var:  ImGuiStyleVar_CellPadding.
 - Tab Bar: Made it possible to append to an existing tab bar by calling BeginTabBar()/EndTabBar() again.
@@ -192,11 +192,13 @@ Other Changes:
 - Backends: OpenGL3: Backup and restore GL_PRIMITIVE_RESTART state. (#3544) [@Xipiryon]
 - Backends: OpenGL2, OpenGL3: Backup and restore GL_STENCIL_TEST enable state. (#3668)
 - Backends: Vulkan: Added support for specifying which subpass to reference during VkPipeline creation. (@3579) [@bdero]
+- Backends: DX12: Improve Windows 7 compatibility (for D3D12On7) by loading d3d12.dll dynamically. (#3696) [@Mattiwatti]
 - Backends: Win32: Fix setting of io.DisplaySize to invalid/uninitialized data after hwnd has been closed.
 - Backends: OSX: Fix keypad-enter key not working on MacOS. (#3554) [@rokups, @lfnoise]
 - Examples: Apple+Metal: Consolidated/simplified to get closer to other examples. (#3543) [@warrenm]
 - Examples: Apple+Metal: Forward events down so OS key combination like Cmd+Q can work. (#3554) [@rokups]
 - Examples: Emscripten: Renamed example_emscripten/ to example_emscripten_opengl3/. (#3632)
+- Examples: Emscripten: Added 'make serve' helper to spawn a web-server on localhost. (#3705) [@Horki]
 - Examples: DirectX12: Move ImGui::Render() call above the first barrier to clarify its lack of effect on the graphics pipe.
 - CI: Fix testing for Windows DLL builds. (#3603, #3601) [@iboB]
 - Docs: Split examples/README.txt into docs/BACKENDS.md and docs/EXAMPLES.md improved them.

examples/example_emscripten_opengl3/Makefile

@@ -7,15 +7,16 @@
 # (On Windows, you may need to execute emsdk_env.bat or encmdprompt.bat ahead)
 #
 # Running `make` will produce three files:
-#  - example_emscripten_opengl3.html
+#  - web/index.html
-#  - example_emscripten_opengl3.js
+#  - web/index.js
-#  - example_emscripten_opengl3.wasm
+#  - web/index.wasm
 #
 # All three are needed to run the demo.
 
 CC = emcc
 CXX = em++
-EXE = example_emscripten_opengl3.html
+WEB_DIR = web
+EXE = $(WEB_DIR)/index.html
 IMGUI_DIR = ../..
 SOURCES = main.cpp
 SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
@@ -78,8 +79,14 @@ LDFLAGS += --shell-file shell_minimal.html
 all: $(EXE)
 	@echo Build complete for $(EXE)
 
-$(EXE): $(OBJS)
+$(WEB_DIR):
-	$(CXX) -o $@ $^ $(LIBS) $(LDFLAGS)
+	mkdir $@
+
+serve: all
+	python3 -m http.server -d $(WEB_DIR)
+
+$(EXE): $(OBJS) $(WEB_DIR)
+	$(CXX) -o $@ $(OBJS) $(LIBS) $(LDFLAGS)
 
 clean:
-	rm -f $(EXE) $(OBJS) *.js *.wasm *.wasm.pre
+	rm -rf $(OBJS) $(WEB_DIR)

examples/example_emscripten_opengl3/README.md

@@ -1,4 +1,3 @@
-
 ## How to Build
 
 - You need to install Emscripten from https://emscripten.org/docs/getting_started/downloads.html, and have the environment variables set, as described in https://emscripten.org/docs/getting_started/downloads.html#installation-instructions
@@ -9,10 +8,13 @@
 ## How to Run
 
 To run on a local machine:
-- Generally you may need a local webserver. Quoting [https://emscripten.org/docs/getting_started](https://emscripten.org/docs/getting_started/Tutorial.html#generating-html):<br>
+- `make serve` will use Python3 to spawn a local webserver, you can then browse http://localhost:8000 to access your build.
+- Otherwise, generally you will need a local webserver:
+  - Quoting [https://emscripten.org/docs/getting_started](https://emscripten.org/docs/getting_started/Tutorial.html#generating-html):<br>
 _"Unfortunately several browsers (including Chrome, Safari, and Internet Explorer) do not support file:// [XHR](https://emscripten.org/docs/site/glossary.html#term-xhr) requests, and can’t load extra files needed by the HTML (like a .wasm file, or packaged file data as mentioned lower down). For these browsers you’ll need to serve the files using a [local webserver](https://emscripten.org/docs/getting_started/FAQ.html#faq-local-webserver) and then open http://localhost:8000/hello.html."_
-- Emscripten SDK has a handy `emrun` command: `emrun example_emscripten_opengl3.html` which will spawn a temporary local webserver. See https://emscripten.org/docs/compiling/Running-html-files-with-emrun.html for details.
+  - Emscripten SDK has a handy `emrun` command: `emrun web/example_emscripten_opengl3.html --browser firefox` which will spawn a temporary local webserver (in Firefox). See https://emscripten.org/docs/compiling/Running-html-files-with-emrun.html for details.
-- Otherwise you may use Python builtin webserver: `python -m http.server` in Python 3 or `python -m SimpleHTTPServer` in Python 2. After doing that, you can visit http://localhost:8000/.
+  - You may use Python 3 builtin webserver: `python -m http.server -d web` (this is what `make serve` uses).
+  - You may use Python 2 builtin webserver: `cd web && python -m SimpleHTTPServer`.
 
 ## Obsolete features:
 

imgui.cpp

@@ -6678,7 +6678,8 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         // This works but 1. doesn't handle multiple Begin/End pairs, 2. recursing into another Begin/End pair - so we need to work that out and add better logging scope.
         // Maybe we can support CTRL+C on every element?
         /*
-        if (g.ActiveId == move_id)
+        //if (g.NavWindow == window && g.ActiveId == 0)
+        if (g.ActiveId == window->MoveId)
             if (g.IO.KeyCtrl && IsKeyPressedMap(ImGuiKey_C))
                 LogToClipboard();
         */
@@ -15738,8 +15739,8 @@ void ImGui::ShowMetricsWindow(bool* p_open)
     // Debugging enums
     enum { WRT_OuterRect, WRT_OuterRectClipped, WRT_InnerRect, WRT_InnerClipRect, WRT_WorkRect, WRT_Content, WRT_ContentRegionRect, WRT_Count }; // Windows Rect Type
     const char* wrt_rects_names[WRT_Count] = { "OuterRect", "OuterRectClipped", "InnerRect", "InnerClipRect", "WorkRect", "Content", "ContentRegionRect" };
-    enum { TRT_OuterRect, TRT_InnerRect, TRT_WorkRect, TRT_HostClipRect, TRT_InnerClipRect, TRT_BackgroundClipRect, TRT_ColumnsRect, TRT_ColumnsClipRect, TRT_ColumnsContentHeadersUsed, TRT_ColumnsContentHeadersIdeal, TRT_ColumnsContentFrozen, TRT_ColumnsContentUnfrozen, TRT_Count }; // Tables Rect Type
+    enum { TRT_OuterRect, TRT_InnerRect, TRT_WorkRect, TRT_HostClipRect, TRT_InnerClipRect, TRT_BackgroundClipRect, TRT_ColumnsRect, TRT_ColumnsWorkRect, TRT_ColumnsClipRect, TRT_ColumnsContentHeadersUsed, TRT_ColumnsContentHeadersIdeal, TRT_ColumnsContentFrozen, TRT_ColumnsContentUnfrozen, TRT_Count }; // Tables Rect Type
-    const char* trt_rects_names[TRT_Count] = { "OuterRect", "InnerRect", "WorkRect", "HostClipRect", "InnerClipRect", "BackgroundClipRect", "ColumnsRect", "ColumnsClipRect", "ColumnsContentHeadersUsed", "ColumnsContentHeadersIdeal", "ColumnsContentFrozen", "ColumnsContentUnfrozen" };
+    const char* trt_rects_names[TRT_Count] = { "OuterRect", "InnerRect", "WorkRect", "HostClipRect", "InnerClipRect", "BackgroundClipRect", "ColumnsRect", "ColumnsWorkRect", "ColumnsClipRect", "ColumnsContentHeadersUsed", "ColumnsContentHeadersIdeal", "ColumnsContentFrozen", "ColumnsContentUnfrozen" };
     if (cfg->ShowWindowsRectsType < 0)
         cfg->ShowWindowsRectsType = WRT_WorkRect;
     if (cfg->ShowTablesRectsType < 0)
@@ -15756,6 +15757,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
             else if (rect_type == TRT_InnerClipRect)            { return table->InnerClipRect; }
             else if (rect_type == TRT_BackgroundClipRect)       { return table->BgClipRect; }
             else if (rect_type == TRT_ColumnsRect)              { ImGuiTableColumn* c = &table->Columns[n]; return ImRect(c->MinX, table->InnerClipRect.Min.y, c->MaxX, table->InnerClipRect.Min.y + table->LastOuterHeight); }
+            else if (rect_type == TRT_ColumnsWorkRect)          { ImGuiTableColumn* c = &table->Columns[n]; return ImRect(c->WorkMinX, table->WorkRect.Min.y, c->WorkMaxX, table->WorkRect.Max.y); }
             else if (rect_type == TRT_ColumnsClipRect)          { ImGuiTableColumn* c = &table->Columns[n]; return c->ClipRect; }
             else if (rect_type == TRT_ColumnsContentHeadersUsed){ ImGuiTableColumn* c = &table->Columns[n]; return ImRect(c->WorkMinX, table->InnerClipRect.Min.y, c->ContentMaxXHeadersUsed, table->InnerClipRect.Min.y + table->LastFirstRowHeight); } // Note: y1/y2 not always accurate
             else if (rect_type == TRT_ColumnsContentHeadersIdeal){ImGuiTableColumn* c = &table->Columns[n]; return ImRect(c->WorkMinX, table->InnerClipRect.Min.y, c->ContentMaxXHeadersIdeal, table->InnerClipRect.Min.y + table->LastFirstRowHeight); }

imgui.h

@@ -60,7 +60,7 @@ Index of this file:
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
 #define IMGUI_VERSION               "1.80 WIP"
-#define IMGUI_VERSION_NUM           17909
+#define IMGUI_VERSION_NUM           17911
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 #define IMGUI_HAS_TABLE
 #define IMGUI_HAS_VIEWPORT          // Viewport WIP branch
@@ -83,7 +83,7 @@ Index of this file:
 #endif
 #define IM_ARRAYSIZE(_ARR)          ((int)(sizeof(_ARR) / sizeof(*(_ARR))))     // Size of a static C-style array. Don't use on pointers!
 #define IM_UNUSED(_VAR)             ((void)(_VAR))                              // Used to silence "unused variable warnings". Often useful as asserts may be stripped out from final builds.
-#if (__cplusplus >= 201100)
+#if (__cplusplus >= 201100) || (defined(_MSVC_LANG) && _MSVC_LANG >= 201100)
 #define IM_OFFSETOF(_TYPE,_MEMBER)  offsetof(_TYPE, _MEMBER)                    // Offset of _MEMBER within _TYPE. Standardized as offsetof() in C++11
 #else
 #define IM_OFFSETOF(_TYPE,_MEMBER)  ((size_t)&(((_TYPE*)0)->_MEMBER))           // Offset of _MEMBER within _TYPE. Old style macro.
@@ -580,7 +580,7 @@ namespace ImGui
     IMGUI_API void          TreePop();                                                          // ~ Unindent()+PopId()
     IMGUI_API float         GetTreeNodeToLabelSpacing();                                        // horizontal distance preceding label when using TreeNode*() or Bullet() == (g.FontSize + style.FramePadding.x*2) for a regular unframed TreeNode
     IMGUI_API bool          CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags = 0);  // if returning 'true' the header is open. doesn't indent nor push on ID stack. user doesn't have to call TreePop().
-    IMGUI_API bool          CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags flags = 0); // when 'p_open' isn't NULL, display an additional small close button on upper right of the header
+    IMGUI_API bool          CollapsingHeader(const char* label, bool* p_visible, ImGuiTreeNodeFlags flags = 0); // when 'p_visible != NULL': if '*p_visible==true' display an additional small close button on upper right of the header which will set the bool to false when clicked, if '*p_visible==false' don't display the header.
     IMGUI_API void          SetNextItemOpen(bool is_open, ImGuiCond cond = 0);                  // set next TreeNode/CollapsingHeader open state.
 
     // Widgets: Selectables
@@ -668,9 +668,10 @@ namespace ImGui
     IMGUI_API bool          IsPopupOpen(const char* str_id, ImGuiPopupFlags flags = 0);                         // return true if the popup is open.
 
     // Tables
-    // [BETA API] API may evolve!
+    // [BETA API] API may evolve slightly! If you use this, please update to the next version when it comes out!
     // - Full-featured replacement for old Columns API.
-    // - See Demo->Tables for details.
+    // - See Demo->Tables for demo code.
+    // - See top of imgui_tables.cpp for general commentary.
     // - See ImGuiTableFlags_ and ImGuiTableColumnFlags_ enums for a description of available flags.
     // The typical call flow is:
     // - 1. Call BeginTable()
@@ -683,25 +684,19 @@ namespace ImGui
     //      you may prefer using TableNextColumn() instead of TableNextRow() + TableSetColumnIndex().
     //      TableNextColumn() will automatically wrap-around into the next row if needed.
     //    - IMPORTANT: Comparatively to the old Columns() API, we need to call TableNextColumn() for the first column!
-    //    - Both TableSetColumnIndex() and TableNextColumn() return true when the column is visible or performing
-    //      width measurements. Otherwise, you may skip submitting the contents of a cell/column, BUT ONLY if you know
-    //      it is not going to contribute to row height.
-    //      In many situations, you may skip submitting contents for every columns but one (e.g. the first one).
     //    - Summary of possible call flow:
-    //      ----------------------------------------------------------------------------------------------------------
+    //        --------------------------------------------------------------------------------------------------------
     //        TableNextRow() -> TableSetColumnIndex(0) -> Text("Hello 0") -> TableSetColumnIndex(1) -> Text("Hello 1")  // OK
     //        TableNextRow() -> TableNextColumn()      -> Text("Hello 0") -> TableNextColumn()      -> Text("Hello 1")  // OK
     //                          TableNextColumn()      -> Text("Hello 0") -> TableNextColumn()      -> Text("Hello 1")  // OK: TableNextColumn() automatically gets to next row!
     //        TableNextRow()                           -> Text("Hello 0")                                               // Not OK! Missing TableSetColumnIndex() or TableNextColumn()! Text will not appear!
-    //      ----------------------------------------------------------------------------------------------------------
+    //        --------------------------------------------------------------------------------------------------------
     // - 5. Call EndTable()
     IMGUI_API bool          BeginTable(const char* str_id, int columns_count, ImGuiTableFlags flags = 0, const ImVec2& outer_size = ImVec2(-FLT_MIN, 0), float inner_width = 0.0f);
     IMGUI_API void          EndTable();                                 // only call EndTable() if BeginTable() returns true!
     IMGUI_API void          TableNextRow(ImGuiTableRowFlags row_flags = 0, float min_row_height = 0.0f); // append into the first cell of a new row.
     IMGUI_API bool          TableNextColumn();                          // append into the next column (or first column of next row if currently in last column). Return true when column is visible.
     IMGUI_API bool          TableSetColumnIndex(int column_n);          // append into the specified column. Return true when column is visible.
-    IMGUI_API int           TableGetColumnIndex();                      // return current column index.
-    IMGUI_API int           TableGetRowIndex();                         // return current row index.
     // Tables: Headers & Columns declaration
     // - Use TableSetupColumn() to specify label, resizing policy, default width/weight, id, various other flags etc.
     //   Important: this will not display anything! The name passed to TableSetupColumn() is used by TableHeadersRow() and context-menus.
@@ -709,7 +704,7 @@ namespace ImGui
     //   Headers are required to perform: reordering, sorting, and opening the context menu (but context menu can also be available in columns body using ImGuiTableFlags_ContextMenuInBody).
     // - You may manually submit headers using TableNextRow() + TableHeader() calls, but this is only useful in some advanced cases (e.g. adding custom widgets in header row).
     // - Use TableSetupScrollFreeze() to lock columns (from the right) or rows (from the top) so they stay visible when scrolled.
-    IMGUI_API void          TableSetupColumn(const char* label, ImGuiTableColumnFlags flags = 0, float init_width_or_weight = -1.0f, ImU32 user_id = 0);
+    IMGUI_API void          TableSetupColumn(const char* label, ImGuiTableColumnFlags flags = 0, float init_width_or_weight = 0.0f, ImU32 user_id = 0);
     IMGUI_API void          TableSetupScrollFreeze(int cols, int rows); // lock columns/rows so they stay visible when scrolled.
     IMGUI_API void          TableHeadersRow();                          // submit all headers cells based on data provided to TableSetupColumn() + submit context menu
     IMGUI_API void          TableHeader(const char* label);             // submit one header cell manually (rarely used)
@@ -720,10 +715,12 @@ namespace ImGui
     //   Make sure to set 'SpecsDirty = false' after sorting, else you may wastefully sort your data every frame!
     //   Lifetime: don't hold on this pointer over multiple frames or past any subsequent call to BeginTable().
     IMGUI_API int                   TableGetColumnCount();                      // return number of columns (value passed to BeginTable)
+    IMGUI_API int                   TableGetColumnIndex();                      // return current column index.
+    IMGUI_API int                   TableGetRowIndex();                         // return current row index.
     IMGUI_API const char*           TableGetColumnName(int column_n = -1);      // return "" if column didn't have a name declared by TableSetupColumn(). Pass -1 to use current column.
-    IMGUI_API ImGuiTableColumnFlags TableGetColumnFlags(int column_n = -1);     // return column flags so you can query their Enabled/Visible/Sorted/Hovered status flags.
+    IMGUI_API ImGuiTableColumnFlags TableGetColumnFlags(int column_n = -1);     // return column flags so you can query their Enabled/Visible/Sorted/Hovered status flags. Pass -1 to use current column.
     IMGUI_API ImGuiTableSortSpecs*  TableGetSortSpecs();                        // get latest sort specs for the table (NULL if not sorting).
-    IMGUI_API void                  TableSetBgColor(ImGuiTableBgTarget bg_target, ImU32 color, int column_n = -1);  // change the color of a cell, row, or column. See ImGuiTableBgTarget_ flags for details.
+    IMGUI_API void                  TableSetBgColor(ImGuiTableBgTarget target, ImU32 color, int column_n = -1);  // change the color of a cell, row, or column. See ImGuiTableBgTarget_ flags for details.
 
     // Legacy Columns API (2020: prefer using Tables!)
     // - You can also use SameLine(pos_x) to mimic simplified columns.
@@ -1079,6 +1076,7 @@ enum ImGuiTabItemFlags_
 };
 
 // Flags for ImGui::BeginTable()
+// [BETA API] API may evolve slightly! If you use this, please update to the next version when it comes out!
 // - Important! Sizing policies have complex and subtle side effects, more so than you would expect.
 //   Read comments/demos carefully + experiment with live demos to get acquainted with them.
 // - The DEFAULT sizing policies are:
@@ -1093,7 +1091,7 @@ enum ImGuiTabItemFlags_
 //      The typical use of mixing sizing policies is: any number of LEADING Fixed columns, followed by one or two TRAILING Stretch columns.
 //      (this is because the visible order of columns have subtle but necessary effects on how they react to manual resizing).
 // - When ScrollX is on:
-//    - Table defaults to ImGuiTableFlags_SizingFixedFit -> all Columns defaults to ImGuiTableColumnFlags_WidthFixed or ImGuiTableColumnFlags_WidthAuto.
+//    - Table defaults to ImGuiTableFlags_SizingFixedFit -> all Columns defaults to ImGuiTableColumnFlags_WidthFixed
 //    - Columns sizing policy allowed: Fixed/Auto mostly.
 //    - Fixed Columns can be enlarged as needed. Table will show an horizontal scrollbar if needed.
 //    - When using auto-resizing (non-resizable) fixed columns, querying the content width to use item right-alignment e.g. SetNextItemWidth(-FLT_MIN) doesn't make sense, would create a feedback loop.
@@ -1135,7 +1133,7 @@ enum ImGuiTableFlags_
     // Clipping
     ImGuiTableFlags_NoClip                          = 1 << 19,  // Disable clipping rectangle for every individual columns (reduce draw command count, items will be able to overflow into other columns). Generally incompatible with TableSetupScrollFreeze().
     // Padding
-    ImGuiTableFlags_PadOuterX                       = 1 << 20,  // Default if BordersOuterV is on. Enable outer-most padding.
+    ImGuiTableFlags_PadOuterX                       = 1 << 20,  // Default if BordersOuterV is on. Enable outer-most padding. Generally desirable if you have headers.
     ImGuiTableFlags_NoPadOuterX                     = 1 << 21,  // Default if BordersOuterV is off. Disable outer-most padding.
     ImGuiTableFlags_NoPadInnerX                     = 1 << 22,  // Disable inner padding between columns (double inner padding if BordersOuterV is on, single inner padding if BordersOuterV is off).
     // Scrolling
@@ -1150,8 +1148,8 @@ enum ImGuiTableFlags_
 
     // Obsolete names (will be removed soon)
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    , ImGuiTableFlags_ColumnsWidthFixed = ImGuiTableFlags_SizingFixedFit, ImGuiTableFlags_ColumnsWidthStretch = ImGuiTableFlags_SizingStretchSame   // WIP Tables 2020/12
+    //, ImGuiTableFlags_ColumnsWidthFixed = ImGuiTableFlags_SizingFixedFit, ImGuiTableFlags_ColumnsWidthStretch = ImGuiTableFlags_SizingStretchSame   // WIP Tables 2020/12
-    , ImGuiTableFlags_SizingPolicyFixed = ImGuiTableFlags_SizingFixedFit, ImGuiTableFlags_SizingPolicyStretch = ImGuiTableFlags_SizingStretchSame   // WIP Tables 2021/01
+    //, ImGuiTableFlags_SizingPolicyFixed = ImGuiTableFlags_SizingFixedFit, ImGuiTableFlags_SizingPolicyStretch = ImGuiTableFlags_SizingStretchSame   // WIP Tables 2021/01
 #endif
 };
 
@@ -1164,7 +1162,6 @@ enum ImGuiTableColumnFlags_
     ImGuiTableColumnFlags_DefaultSort               = 1 << 1,   // Default as a sorting column.
     ImGuiTableColumnFlags_WidthStretch              = 1 << 2,   // Column will stretch. Preferable with horizontal scrolling disabled (default if table sizing policy is _SizingStretchSame or _SizingStretchProp).
     ImGuiTableColumnFlags_WidthFixed                = 1 << 3,   // Column will not stretch. Preferable with horizontal scrolling enabled (default if table sizing policy is _SizingFixedFit and table is resizable).
-    ImGuiTableColumnFlags_WidthAuto                 = 1 << 4,   // Column will not stretch and keep resizing based on submitted contents (default if table sizing policy is _SizingFixedFit and table is not resizable, or policy is _SizingFixedSame). Generally compatible with using right-most fitting widgets (e.g. SetNextItemWidth(-FLT_MIN))
     ImGuiTableColumnFlags_NoResize                  = 1 << 5,   // Disable manual resizing.
     ImGuiTableColumnFlags_NoReorder                 = 1 << 6,   // Disable manual reordering this column, this will also prevent other columns from crossing over this column.
     ImGuiTableColumnFlags_NoHide                    = 1 << 7,   // Disable ability to hide/disable this column.
@@ -1185,10 +1182,15 @@ enum ImGuiTableColumnFlags_
     ImGuiTableColumnFlags_IsHovered                 = 1 << 23,  // Status: is hovered by mouse
 
     // [Internal] Combinations and masks
-    ImGuiTableColumnFlags_WidthMask_                = ImGuiTableColumnFlags_WidthStretch | ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_WidthAuto,
+    ImGuiTableColumnFlags_WidthMask_                = ImGuiTableColumnFlags_WidthStretch | ImGuiTableColumnFlags_WidthFixed,
     ImGuiTableColumnFlags_IndentMask_               = ImGuiTableColumnFlags_IndentEnable | ImGuiTableColumnFlags_IndentDisable,
     ImGuiTableColumnFlags_StatusMask_               = ImGuiTableColumnFlags_IsEnabled | ImGuiTableColumnFlags_IsVisible | ImGuiTableColumnFlags_IsSorted | ImGuiTableColumnFlags_IsHovered,
     ImGuiTableColumnFlags_NoDirectResize_           = 1 << 30   // [Internal] Disable user resizing this column directly (it may however we resized indirectly from its left edge)
+
+    // Obsolete names (will be removed soon)
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    //ImGuiTableColumnFlags_WidthAuto               = ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_NoResize, // Column will not stretch and keep resizing based on submitted contents.
+#endif
 };
 
 // Flags for ImGui::TableNextRow()

imgui_demo.cpp

@@ -1408,9 +1408,149 @@ static void ShowDemoWindowWidgets()
         ImGui::TreePop();
     }
 
-    // Plot/Graph widgets are currently fairly limited.
+    // Tabs
-    // Consider writing your own plotting widget, or using a third-party one
+    if (ImGui::TreeNode("Tabs"))
-    // (for third-party Plot widgets, see 'Wiki->Useful Widgets' or https://github.com/ocornut/imgui/labels/plot%2Fgraph)
+    {
+        if (ImGui::TreeNode("Basic"))
+        {
+            ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_None;
+            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
+            {
+                if (ImGui::BeginTabItem("Avocado"))
+                {
+                    ImGui::Text("This is the Avocado tab!\nblah blah blah blah blah");
+                    ImGui::EndTabItem();
+                }
+                if (ImGui::BeginTabItem("Broccoli"))
+                {
+                    ImGui::Text("This is the Broccoli tab!\nblah blah blah blah blah");
+                    ImGui::EndTabItem();
+                }
+                if (ImGui::BeginTabItem("Cucumber"))
+                {
+                    ImGui::Text("This is the Cucumber tab!\nblah blah blah blah blah");
+                    ImGui::EndTabItem();
+                }
+                ImGui::EndTabBar();
+            }
+            ImGui::Separator();
+            ImGui::TreePop();
+        }
+
+        if (ImGui::TreeNode("Advanced & Close Button"))
+        {
+            // Expose a couple of the available flags. In most cases you may just call BeginTabBar() with no flags (0).
+            static ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_Reorderable;
+            ImGui::CheckboxFlags("ImGuiTabBarFlags_Reorderable", &tab_bar_flags, ImGuiTabBarFlags_Reorderable);
+            ImGui::CheckboxFlags("ImGuiTabBarFlags_AutoSelectNewTabs", &tab_bar_flags, ImGuiTabBarFlags_AutoSelectNewTabs);
+            ImGui::CheckboxFlags("ImGuiTabBarFlags_TabListPopupButton", &tab_bar_flags, ImGuiTabBarFlags_TabListPopupButton);
+            ImGui::CheckboxFlags("ImGuiTabBarFlags_NoCloseWithMiddleMouseButton", &tab_bar_flags, ImGuiTabBarFlags_NoCloseWithMiddleMouseButton);
+            if ((tab_bar_flags & ImGuiTabBarFlags_FittingPolicyMask_) == 0)
+                tab_bar_flags |= ImGuiTabBarFlags_FittingPolicyDefault_;
+            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyResizeDown", &tab_bar_flags, ImGuiTabBarFlags_FittingPolicyResizeDown))
+                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyResizeDown);
+            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyScroll", &tab_bar_flags, ImGuiTabBarFlags_FittingPolicyScroll))
+                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyScroll);
+
+            // Tab Bar
+            const char* names[4] = { "Artichoke", "Beetroot", "Celery", "Daikon" };
+            static bool opened[4] = { true, true, true, true }; // Persistent user state
+            for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
+            {
+                if (n > 0) { ImGui::SameLine(); }
+                ImGui::Checkbox(names[n], &opened[n]);
+            }
+
+            // Passing a bool* to BeginTabItem() is similar to passing one to Begin():
+            // the underlying bool will be set to false when the tab is closed.
+            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
+            {
+                for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
+                    if (opened[n] && ImGui::BeginTabItem(names[n], &opened[n], ImGuiTabItemFlags_None))
+                    {
+                        ImGui::Text("This is the %s tab!", names[n]);
+                        if (n & 1)
+                            ImGui::Text("I am an odd tab.");
+                        ImGui::EndTabItem();
+                    }
+                ImGui::EndTabBar();
+            }
+            ImGui::Separator();
+            ImGui::TreePop();
+        }
+
+        if (ImGui::TreeNode("TabItemButton & Leading/Trailing flags"))
+        {
+            static ImVector<int> active_tabs;
+            static int next_tab_id = 0;
+            if (next_tab_id == 0) // Initialize with some default tabs
+                for (int i = 0; i < 3; i++)
+                    active_tabs.push_back(next_tab_id++);
+
+            // TabItemButton() and Leading/Trailing flags are distinct features which we will demo together.
+            // (It is possible to submit regular tabs with Leading/Trailing flags, or TabItemButton tabs without Leading/Trailing flags...
+            // but they tend to make more sense together)
+            static bool show_leading_button = true;
+            static bool show_trailing_button = true;
+            ImGui::Checkbox("Show Leading TabItemButton()", &show_leading_button);
+            ImGui::Checkbox("Show Trailing TabItemButton()", &show_trailing_button);
+
+            // Expose some other flags which are useful to showcase how they interact with Leading/Trailing tabs
+            static ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_AutoSelectNewTabs | ImGuiTabBarFlags_Reorderable | ImGuiTabBarFlags_FittingPolicyResizeDown;
+            ImGui::CheckboxFlags("ImGuiTabBarFlags_TabListPopupButton", &tab_bar_flags, ImGuiTabBarFlags_TabListPopupButton);
+            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyResizeDown", &tab_bar_flags, ImGuiTabBarFlags_FittingPolicyResizeDown))
+                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyResizeDown);
+            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyScroll", &tab_bar_flags, ImGuiTabBarFlags_FittingPolicyScroll))
+                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyScroll);
+
+            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
+            {
+                // Demo a Leading TabItemButton(): click the "?" button to open a menu
+                if (show_leading_button)
+                    if (ImGui::TabItemButton("?", ImGuiTabItemFlags_Leading | ImGuiTabItemFlags_NoTooltip))
+                        ImGui::OpenPopup("MyHelpMenu");
+                if (ImGui::BeginPopup("MyHelpMenu"))
+                {
+                    ImGui::Selectable("Hello!");
+                    ImGui::EndPopup();
+                }
+
+                // Demo Trailing Tabs: click the "+" button to add a new tab (in your app you may want to use a font icon instead of the "+")
+                // Note that we submit it before the regular tabs, but because of the ImGuiTabItemFlags_Trailing flag it will always appear at the end.
+                if (show_trailing_button)
+                    if (ImGui::TabItemButton("+", ImGuiTabItemFlags_Trailing | ImGuiTabItemFlags_NoTooltip))
+                        active_tabs.push_back(next_tab_id++); // Add new tab
+
+                // Submit our regular tabs
+                for (int n = 0; n < active_tabs.Size; )
+                {
+                    bool open = true;
+                    char name[16];
+                    snprintf(name, IM_ARRAYSIZE(name), "%04d", active_tabs[n]);
+                    if (ImGui::BeginTabItem(name, &open, ImGuiTabItemFlags_None))
+                    {
+                        ImGui::Text("This is the %s tab!", name);
+                        ImGui::EndTabItem();
+                    }
+
+                    if (!open)
+                        active_tabs.erase(active_tabs.Data + n);
+                    else
+                        n++;
+                }
+
+                ImGui::EndTabBar();
+            }
+            ImGui::Separator();
+            ImGui::TreePop();
+        }
+        ImGui::TreePop();
+    }
+
+    // Plot/Graph widgets are not very good.
+    // Consider writing your own, or using a third-party one, see:
+    // - ImPlot https://github.com/epezent/implot
+    // - others https://github.com/ocornut/imgui/wiki/Useful-Widgets
     if (ImGui::TreeNode("Plots Widgets"))
     {
         static bool animate = true;
@@ -2437,144 +2577,6 @@ static void ShowDemoWindowLayout()
         ImGui::TreePop();
     }
 
-    if (ImGui::TreeNode("Tabs"))
-    {
-        if (ImGui::TreeNode("Basic"))
-        {
-            ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_None;
-            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
-            {
-                if (ImGui::BeginTabItem("Avocado"))
-                {
-                    ImGui::Text("This is the Avocado tab!\nblah blah blah blah blah");
-                    ImGui::EndTabItem();
-                }
-                if (ImGui::BeginTabItem("Broccoli"))
-                {
-                    ImGui::Text("This is the Broccoli tab!\nblah blah blah blah blah");
-                    ImGui::EndTabItem();
-                }
-                if (ImGui::BeginTabItem("Cucumber"))
-                {
-                    ImGui::Text("This is the Cucumber tab!\nblah blah blah blah blah");
-                    ImGui::EndTabItem();
-                }
-                ImGui::EndTabBar();
-            }
-            ImGui::Separator();
-            ImGui::TreePop();
-        }
-
-        if (ImGui::TreeNode("Advanced & Close Button"))
-        {
-            // Expose a couple of the available flags. In most cases you may just call BeginTabBar() with no flags (0).
-            static ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_Reorderable;
-            ImGui::CheckboxFlags("ImGuiTabBarFlags_Reorderable", &tab_bar_flags, ImGuiTabBarFlags_Reorderable);
-            ImGui::CheckboxFlags("ImGuiTabBarFlags_AutoSelectNewTabs", &tab_bar_flags, ImGuiTabBarFlags_AutoSelectNewTabs);
-            ImGui::CheckboxFlags("ImGuiTabBarFlags_TabListPopupButton", &tab_bar_flags, ImGuiTabBarFlags_TabListPopupButton);
-            ImGui::CheckboxFlags("ImGuiTabBarFlags_NoCloseWithMiddleMouseButton", &tab_bar_flags, ImGuiTabBarFlags_NoCloseWithMiddleMouseButton);
-            if ((tab_bar_flags & ImGuiTabBarFlags_FittingPolicyMask_) == 0)
-                tab_bar_flags |= ImGuiTabBarFlags_FittingPolicyDefault_;
-            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyResizeDown", &tab_bar_flags, ImGuiTabBarFlags_FittingPolicyResizeDown))
-                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyResizeDown);
-            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyScroll", &tab_bar_flags, ImGuiTabBarFlags_FittingPolicyScroll))
-                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyScroll);
-
-            // Tab Bar
-            const char* names[4] = { "Artichoke", "Beetroot", "Celery", "Daikon" };
-            static bool opened[4] = { true, true, true, true }; // Persistent user state
-            for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
-            {
-                if (n > 0) { ImGui::SameLine(); }
-                ImGui::Checkbox(names[n], &opened[n]);
-            }
-
-            // Passing a bool* to BeginTabItem() is similar to passing one to Begin():
-            // the underlying bool will be set to false when the tab is closed.
-            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
-            {
-                for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
-                    if (opened[n] && ImGui::BeginTabItem(names[n], &opened[n], ImGuiTabItemFlags_None))
-                    {
-                        ImGui::Text("This is the %s tab!", names[n]);
-                        if (n & 1)
-                            ImGui::Text("I am an odd tab.");
-                        ImGui::EndTabItem();
-                    }
-                ImGui::EndTabBar();
-            }
-            ImGui::Separator();
-            ImGui::TreePop();
-        }
-
-        if (ImGui::TreeNode("TabItemButton & Leading/Trailing flags"))
-        {
-            static ImVector<int> active_tabs;
-            static int next_tab_id = 0;
-            if (next_tab_id == 0) // Initialize with some default tabs
-                for (int i = 0; i < 3; i++)
-                    active_tabs.push_back(next_tab_id++);
-
-            // TabItemButton() and Leading/Trailing flags are distinct features which we will demo together.
-            // (It is possible to submit regular tabs with Leading/Trailing flags, or TabItemButton tabs without Leading/Trailing flags...
-            // but they tend to make more sense together)
-            static bool show_leading_button = true;
-            static bool show_trailing_button = true;
-            ImGui::Checkbox("Show Leading TabItemButton()", &show_leading_button);
-            ImGui::Checkbox("Show Trailing TabItemButton()", &show_trailing_button);
-
-            // Expose some other flags which are useful to showcase how they interact with Leading/Trailing tabs
-            static ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_AutoSelectNewTabs | ImGuiTabBarFlags_Reorderable | ImGuiTabBarFlags_FittingPolicyResizeDown;
-            ImGui::CheckboxFlags("ImGuiTabBarFlags_TabListPopupButton", &tab_bar_flags, ImGuiTabBarFlags_TabListPopupButton);
-            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyResizeDown", &tab_bar_flags, ImGuiTabBarFlags_FittingPolicyResizeDown))
-                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyResizeDown);
-            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyScroll", &tab_bar_flags, ImGuiTabBarFlags_FittingPolicyScroll))
-                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyScroll);
-
-            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
-            {
-                // Demo a Leading TabItemButton(): click the "?" button to open a menu
-                if (show_leading_button)
-                    if (ImGui::TabItemButton("?", ImGuiTabItemFlags_Leading | ImGuiTabItemFlags_NoTooltip))
-                        ImGui::OpenPopup("MyHelpMenu");
-                if (ImGui::BeginPopup("MyHelpMenu"))
-                {
-                    ImGui::Selectable("Hello!");
-                    ImGui::EndPopup();
-                }
-
-                // Demo Trailing Tabs: click the "+" button to add a new tab (in your app you may want to use a font icon instead of the "+")
-                // Note that we submit it before the regular tabs, but because of the ImGuiTabItemFlags_Trailing flag it will always appear at the end.
-                if (show_trailing_button)
-                    if (ImGui::TabItemButton("+", ImGuiTabItemFlags_Trailing | ImGuiTabItemFlags_NoTooltip))
-                        active_tabs.push_back(next_tab_id++); // Add new tab
-
-                // Submit our regular tabs
-                for (int n = 0; n < active_tabs.Size; )
-                {
-                    bool open = true;
-                    char name[16];
-                    snprintf(name, IM_ARRAYSIZE(name), "%04d", active_tabs[n]);
-                    if (ImGui::BeginTabItem(name, &open, ImGuiTabItemFlags_None))
-                    {
-                        ImGui::Text("This is the %s tab!", name);
-                        ImGui::EndTabItem();
-                    }
-
-                    if (!open)
-                        active_tabs.erase(active_tabs.Data + n);
-                    else
-                        n++;
-                }
-
-                ImGui::EndTabBar();
-            }
-            ImGui::Separator();
-            ImGui::TreePop();
-        }
-        ImGui::TreePop();
-    }
-
     if (ImGui::TreeNode("Groups"))
     {
         HelpMarker(
@@ -3463,8 +3465,6 @@ static void EditTableColumnsFlags(ImGuiTableColumnFlags* p_flags)
         *p_flags &= ~(ImGuiTableColumnFlags_WidthMask_ ^ ImGuiTableColumnFlags_WidthStretch);
     if (ImGui::CheckboxFlags("_WidthFixed", p_flags, ImGuiTableColumnFlags_WidthFixed))
         *p_flags &= ~(ImGuiTableColumnFlags_WidthMask_ ^ ImGuiTableColumnFlags_WidthFixed);
-    if (ImGui::CheckboxFlags("_WidthAuto", p_flags, ImGuiTableColumnFlags_WidthAuto))
-        *p_flags &= ~(ImGuiTableColumnFlags_WidthMask_ ^ ImGuiTableColumnFlags_WidthAuto);
     ImGui::CheckboxFlags("_NoResize", p_flags, ImGuiTableColumnFlags_NoResize);
     ImGui::CheckboxFlags("_NoReorder", p_flags, ImGuiTableColumnFlags_NoReorder);
     ImGui::CheckboxFlags("_NoHide", p_flags, ImGuiTableColumnFlags_NoHide);
@@ -4244,16 +4244,44 @@ static void ShowDemoWindowTables()
         ImGui::SetNextItemOpen(open_action != 0);
     if (ImGui::TreeNode("Columns widths"))
     {
-        HelpMarker("Using TableSetupColumn() to setup explicit width.");
+        HelpMarker("Using TableSetupColumn() to setup default width.");
 
-        static ImGuiTableFlags flags = ImGuiTableFlags_None;
+        static ImGuiTableFlags flags1 = ImGuiTableFlags_Borders | ImGuiTableFlags_NoBordersInBodyUntilResize;
         PushStyleCompact();
-        ImGui::CheckboxFlags("ImGuiTableFlags_NoKeepColumnsVisible", &flags, ImGuiTableFlags_NoKeepColumnsVisible);
+        ImGui::CheckboxFlags("ImGuiTableFlags_Resizable", &flags1, ImGuiTableFlags_Resizable);
-        ImGui::CheckboxFlags("ImGuiTableFlags_BordersInnerV", &flags, ImGuiTableFlags_BordersInnerV);
+        ImGui::CheckboxFlags("ImGuiTableFlags_NoBordersInBodyUntilResize", &flags1, ImGuiTableFlags_NoBordersInBodyUntilResize);
-        ImGui::CheckboxFlags("ImGuiTableFlags_BordersOuterV", &flags, ImGuiTableFlags_BordersOuterV);
         PopStyleCompact();
+        if (ImGui::BeginTable("##table1", 3, flags1))
+        {
+            // We could also set ImGuiTableFlags_SizingFixedFit on the table and all columns will default to ImGuiTableColumnFlags_WidthFixed.
+            ImGui::TableSetupColumn("one", ImGuiTableColumnFlags_WidthFixed, 100.0f); // Default to 100.0f
+            ImGui::TableSetupColumn("two", ImGuiTableColumnFlags_WidthFixed, 200.0f); // Default to 200.0f
+            ImGui::TableSetupColumn("three", ImGuiTableColumnFlags_WidthFixed);       // Default to auto
+            ImGui::TableHeadersRow();
+            for (int row = 0; row < 4; row++)
+            {
+                ImGui::TableNextRow();
+                for (int column = 0; column < 3; column++)
+                {
+                    ImGui::TableSetColumnIndex(column);
+                    if (row == 0)
+                        ImGui::Text("(w: %5.1f)", ImGui::GetContentRegionAvail().x);
+                    else
+                        ImGui::Text("Hello %d,%d", column, row);
+                }
+            }
+            ImGui::EndTable();
+        }
 
-        if (ImGui::BeginTable("##table1", 4, flags))
+        HelpMarker("Using TableSetupColumn() to setup explicit width.\n\nUnless _NoKeepColumnsVisible is set, fixed columns with set width may still be shrunk down if there's not enough space in the host.");
+
+        static ImGuiTableFlags flags2 = ImGuiTableFlags_None;
+        PushStyleCompact();
+        ImGui::CheckboxFlags("ImGuiTableFlags_NoKeepColumnsVisible", &flags2, ImGuiTableFlags_NoKeepColumnsVisible);
+        ImGui::CheckboxFlags("ImGuiTableFlags_BordersInnerV", &flags2, ImGuiTableFlags_BordersInnerV);
+        ImGui::CheckboxFlags("ImGuiTableFlags_BordersOuterV", &flags2, ImGuiTableFlags_BordersOuterV);
+        PopStyleCompact();
+        if (ImGui::BeginTable("##table2", 4, flags2))
         {
             // We could also set ImGuiTableFlags_SizingFixedFit on the table and all columns will default to ImGuiTableColumnFlags_WidthFixed.
             ImGui::TableSetupColumn("", ImGuiTableColumnFlags_WidthFixed, 100.0f);
@@ -4267,7 +4295,8 @@ static void ShowDemoWindowTables()
                 {
                     ImGui::TableSetColumnIndex(column);
                     if (row == 0)
-                        ImGui::Text("(%.2f)", ImGui::GetContentRegionAvail().x);
+                        ImGui::Text("(w: %5.1f)", ImGui::GetContentRegionAvail().x);
+                    else
                         ImGui::Text("Hello %d,%d", column, row);
                 }
             }
@@ -4633,7 +4662,7 @@ static void ShowDemoWindowTables()
         static ImGuiTableFlags flags1 = ImGuiTableFlags_Resizable | ImGuiTableFlags_Reorderable | ImGuiTableFlags_Hideable | ImGuiTableFlags_Borders | ImGuiTableFlags_ContextMenuInBody;
 
         PushStyleCompact();
-        ImGui::CheckboxFlags("ImGuiTableFlags_ContextMenuInBody", (unsigned int*)&flags1, ImGuiTableFlags_ContextMenuInBody);
+        ImGui::CheckboxFlags("ImGuiTableFlags_ContextMenuInBody", &flags1, ImGuiTableFlags_ContextMenuInBody);
         PopStyleCompact();
 
         // Context Menus: first example
@@ -4806,10 +4835,10 @@ static void ShowDemoWindowTables()
             // - ImGuiTableColumnFlags_DefaultSort
             // - ImGuiTableColumnFlags_NoSort / ImGuiTableColumnFlags_NoSortAscending / ImGuiTableColumnFlags_NoSortDescending
             // - ImGuiTableColumnFlags_PreferSortAscending / ImGuiTableColumnFlags_PreferSortDescending
-            ImGui::TableSetupColumn("ID",       ImGuiTableColumnFlags_DefaultSort          | ImGuiTableColumnFlags_WidthFixed,   -1.0f, MyItemColumnID_ID);
+            ImGui::TableSetupColumn("ID",       ImGuiTableColumnFlags_DefaultSort          | ImGuiTableColumnFlags_WidthFixed,   0.0f, MyItemColumnID_ID);
-            ImGui::TableSetupColumn("Name",                                                  ImGuiTableColumnFlags_WidthFixed,   -1.0f, MyItemColumnID_Name);
+            ImGui::TableSetupColumn("Name",                                                  ImGuiTableColumnFlags_WidthFixed,   0.0f, MyItemColumnID_Name);
-            ImGui::TableSetupColumn("Action",   ImGuiTableColumnFlags_NoSort               | ImGuiTableColumnFlags_WidthFixed,   -1.0f, MyItemColumnID_Action);
+            ImGui::TableSetupColumn("Action",   ImGuiTableColumnFlags_NoSort               | ImGuiTableColumnFlags_WidthFixed,   0.0f, MyItemColumnID_Action);
-            ImGui::TableSetupColumn("Quantity", ImGuiTableColumnFlags_PreferSortDescending | ImGuiTableColumnFlags_WidthStretch, -1.0f, MyItemColumnID_Quantity);
+            ImGui::TableSetupColumn("Quantity", ImGuiTableColumnFlags_PreferSortDescending | ImGuiTableColumnFlags_WidthStretch, 0.0f, MyItemColumnID_Quantity);
             ImGui::TableSetupScrollFreeze(0, 1); // Make row always visible
             ImGui::TableHeadersRow();
 
@@ -5012,11 +5041,11 @@ static void ShowDemoWindowTables()
             // Declare columns
             // We use the "user_id" parameter of TableSetupColumn() to specify a user id that will be stored in the sort specifications.
             // This is so our sort function can identify a column given our own identifier. We could also identify them based on their index!
-            ImGui::TableSetupColumn("ID",           ImGuiTableColumnFlags_DefaultSort | ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_NoHide, -1.0f, MyItemColumnID_ID);
+            ImGui::TableSetupColumn("ID",           ImGuiTableColumnFlags_DefaultSort | ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_NoHide, 0.0f, MyItemColumnID_ID);
-            ImGui::TableSetupColumn("Name",         ImGuiTableColumnFlags_WidthFixed, -1.0f, MyItemColumnID_Name);
+            ImGui::TableSetupColumn("Name",         ImGuiTableColumnFlags_WidthFixed, 0.0f, MyItemColumnID_Name);
-            ImGui::TableSetupColumn("Action",       ImGuiTableColumnFlags_NoSort | ImGuiTableColumnFlags_WidthFixed, -1.0f, MyItemColumnID_Action);
+            ImGui::TableSetupColumn("Action",       ImGuiTableColumnFlags_NoSort | ImGuiTableColumnFlags_WidthFixed, 0.0f, MyItemColumnID_Action);
-            ImGui::TableSetupColumn("Quantity",     ImGuiTableColumnFlags_PreferSortDescending, -1.0f, MyItemColumnID_Quantity);
+            ImGui::TableSetupColumn("Quantity",     ImGuiTableColumnFlags_PreferSortDescending, 0.0f, MyItemColumnID_Quantity);
-            ImGui::TableSetupColumn("Description",  ImGuiTableColumnFlags_WidthStretch, -1.0f, MyItemColumnID_Description);
+            ImGui::TableSetupColumn("Description",  ImGuiTableColumnFlags_WidthStretch, 0.0f, MyItemColumnID_Description);
             ImGui::TableSetupColumn("Hidden",       ImGuiTableColumnFlags_DefaultHide | ImGuiTableColumnFlags_NoSort);
             ImGui::TableSetupScrollFreeze(freeze_cols, freeze_rows);
 
@@ -5614,6 +5643,9 @@ void ImGui::ShowAboutWindow(bool* p_open)
 #ifdef _MSC_VER
         ImGui::Text("define: _MSC_VER=%d", _MSC_VER);
 #endif
+#ifdef _MSVC_LANG
+        ImGui::Text("define: _MSVC_LANG=%d", (int)_MSVC_LANG);
+#endif
 #ifdef __MINGW32__
         ImGui::Text("define: __MINGW32__");
 #endif

imgui_internal.h

@@ -190,7 +190,7 @@ namespace ImStb
 #define IMGUI_DEBUG_LOG_DOCKING(...)    ((void)0)       // Disable log
 
 // Static Asserts
-#if (__cplusplus >= 201100)
+#if (__cplusplus >= 201100) || (defined(_MSVC_LANG) && _MSVC_LANG >= 201100)
 #define IM_STATIC_ASSERT(_COND)         static_assert(_COND, "")
 #else
 #define IM_STATIC_ASSERT(_COND)         typedef char static_assertion_##__line__[(_COND)?1:-1]
@@ -2291,7 +2291,7 @@ struct ImGuiTable
     bool                        IsResetAllRequest;
     bool                        IsResetDisplayOrderRequest;
     bool                        IsUnfrozenRows;             // Set when we got past the frozen row.
-    bool                        IsOuterRectAutoFitX;        // Set when outer_size.x == 0.0f in BeginTable(), scrolling is disabled, and there are stretch columns.
+    bool                        IsOuterRectMinFitX;         // Set when outer_size.x == 0.0f in BeginTable(), scrolling is disabled, and there are no stretch columns.
     bool                        MemoryCompacted;
     bool                        HostSkipItems;              // Backup of InnerWindow->SkipItem at the end of BeginTable(), because we will overwrite InnerWindow->SkipItem on a per-column basis
 

imgui_tables.cpp

@@ -80,13 +80,15 @@ Index of this file:
 //   - outer_size.x = 0.0f  ->  Auto width. Generally use all available width. When NOT using scrolling and NOT using any Stretch column, use only necessary width, otherwise same as -FLT_MIN.
 //   - outer_size.x > 0.0f  ->  Fixed width.
 //   Y with ScrollX/ScrollY disabled: we output table directly in current window
-//   - outer_size.y < 0.0f  ->  Bottom-align (but will auto extend, unless NoHostExtendV is set)
+//   - outer_size.y < 0.0f  ->  Bottom-align (but will auto extend, unless _NoHostExtendY is set). Not meaningful is parent window can vertically scroll.
-//   - outer_size.y = 0.0f  ->  No minimum height (but will auto extend, unless NoHostExtendV is set)
+//   - outer_size.y = 0.0f  ->  No minimum height (but will auto extend, unless _NoHostExtendY is set)
-//   - outer_size.y > 0.0f  ->  Set Minimum height (but will auto extend, unless NoHostExtendV is set)
+//   - outer_size.y > 0.0f  ->  Set Minimum height (but will auto extend, unless _NoHostExtenY is set)
 //   Y with ScrollX/ScrollY enabled: using a child window for scrolling
-//   - outer_size.y < 0.0f  ->  Bottom-align
+//   - outer_size.y < 0.0f  ->  Bottom-align. Not meaningful is parent window can vertically scroll.
 //   - outer_size.y = 0.0f  ->  Bottom-align, consistent with BeginChild(). Not recommended unless table is last item in parent window.
 //   - outer_size.y > 0.0f  ->  Set Exact height. Recommended when using Scrolling on any axis.
+// In theory ImGuiTableFlags_NoHostExtendY could be the default and any non-scrolling tables with outer_size.y != 0.0f would use exact height.
+// This would be consistent but perhaps less useful and more confusing (as vertically clipped items are not easily noticeable)
 //-----------------------------------------------------------------------------
 // About 'inner_width':
 //   With ScrollX disabled:
@@ -108,7 +110,6 @@ Index of this file:
 //-----------------------------------------------------------------------------
 // About overriding column sizing policy and width/weight with TableSetupColumn():
 // We use a default parameter of 'init_width_or_weight == -1'.
-//   - with ImGuiTableColumnFlags_WidthAuto,     init_width       (ignored)  --> width is automatic
 //   - with ImGuiTableColumnFlags_WidthFixed,    init_width  <= 0 (default)  --> width is automatic
 //   - with ImGuiTableColumnFlags_WidthFixed,    init_width  >  0 (explicit) --> width is custom
 //   - with ImGuiTableColumnFlags_WidthStretch,  init_weight <= 0 (default)  --> weight is 1.0f
@@ -117,11 +118,11 @@ Index of this file:
 // and you can fit a 100.0f wide item in it without clipping and with full padding.
 //-----------------------------------------------------------------------------
 // About default sizing policy (if you don't specify a ImGuiTableColumnFlags_WidthXXXX flag)
-//   - with Table policy ImGuiTableFlags_SizingFixedFit    && (Resizable == 1 || init_width > 0)   --> default Column policy is ImGuiTableColumnFlags_WidthFixed, default Width is equal to contents width
+//   - with Table policy ImGuiTableFlags_SizingFixedFit      --> default Column policy is ImGuiTableColumnFlags_WidthFixed, default Width is equal to contents width
-//   - with Table policy ImGuiTableFlags_SizingFixedFit    && (Resizable == 0 && init_width <= 0)  --> default Column policy is ImGuiTableColumnFlags_WidthAuto, Width always equal to contents width
+//   - with Table policy ImGuiTableFlags_SizingFixedSame     --> default Column policy is ImGuiTableColumnFlags_WidthFixed, default Width is max of all contents width
-//   - with Table policy ImGuiTableFlags_SizingFixedSame                                           --> default Column policy is ImGuiTableColumnFlags_WidthAuto, default Width is max of all contents width
 //   - with Table policy ImGuiTableFlags_SizingStretchSame   --> default Column policy is ImGuiTableColumnFlags_WidthStretch, default Weight is 1.0f
 //   - with Table policy ImGuiTableFlags_SizingStretchWeight --> default Column policy is ImGuiTableColumnFlags_WidthStretch, default Weight is proportional to contents
+// Default Width and default Weight can be overriden when calling TableSetupColumn().
 //-----------------------------------------------------------------------------
 // About mixing Fixed/Auto and Stretch columns together:
 //   - the typical use of mixing sizing policies is: any number of LEADING Fixed columns, followed by one or two TRAILING Stretch columns.
@@ -130,6 +131,16 @@ Index of this file:
 //   - when using ImGuiTableFlags_SizingFixedSame with mixed columns, only the Fixed/Auto columns will match their widths to the maximum contents width.
 //   - when using ImGuiTableFlags_SizingStretchSame with mixed columns, only the Stretch columns will match their weight/widths.
 //-----------------------------------------------------------------------------
+// About using column width:
+// If a column is manual resizable or has a width specified with TableSetupColumn():
+//   - you may use GetContentRegionAvail().x to query the width available in a given column.
+//   - right-side alignment features such as SetNextItemWidth(-x) or PushItemWidth(-x) will rely on this width.
+// If the column is not resizable and has no width specified with TableSetupColumn():
+//   - its width will be automatic and be the set to the max of items submitted.
+//   - therefore you generally cannot have ALL items of the columns use e.g. SetNextItemWidth(-FLT_MIN).
+//   - but if the column has one or more item of known/fixed size, this will become the reference width used by SetNextItemWidth(-FLT_MIN).
+//-----------------------------------------------------------------------------
+
 
 //-----------------------------------------------------------------------------
 // TABLES CLIPPING/CULLING
@@ -138,11 +149,15 @@ Index of this file:
 // - For large numbers of rows, it is recommended you use ImGuiListClipper to only submit visible rows.
 //   ImGuiListClipper is reliant on the fact that rows are of equal height.
 //   See 'Demo->Tables->Vertical Scrolling' or 'Demo->Tables->Advanced' for a demo of using the clipper.
-// - Note that columns with the ImGuiTableColumnFlags_WidthAuto policy generally don't play well with using the clipper,
+// - Note that auto-resizing columns don't play well with using the clipper.
-//   and by default a table with _ScrollX but without _Resizable will have columns default to _WidthAuto.
+//   By default a table with _ScrollX but without _Resizable will have column auto-resize.
-//   So, if you want to use the clipper, make sure to either enable _Resizable, either setup columns explicitly with _WidthFixed.
+//   So, if you want to use the clipper, make sure to either enable _Resizable, either setup columns width explicitly with _WidthFixed.
 //-----------------------------------------------------------------------------
 // About clipping/culling of Columns in Tables:
+// - Both TableSetColumnIndex() and TableNextColumn() return true when the column is visible or performing
+//   width measurements. Otherwise, you may skip submitting the contents of a cell/column, BUT ONLY if you know
+//   it is not going to contribute to row height.
+//   In many situations, you may skip submitting contents for every columns but one (e.g. the first one).
 // - Case A: column is not hidden by user, and at least partially in sight (most common case).
 // - Case B: column is clipped / out of sight (because of scrolling or parent ClipRect): TableNextColumn() return false as a hint but we still allow layout output.
 // - Case C: column is hidden explicitly by the user (e.g. via the context menu, or _DefaultHide column flag, etc.).
@@ -320,7 +335,7 @@ bool    ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
     table->ColumnsCount = columns_count;
     table->IsLayoutLocked = false;
     table->InnerWidth = inner_width;
-    table->IsOuterRectAutoFitX = (outer_size.x == 0.0f) && (use_child_window == false);
+    table->IsOuterRectMinFitX = (outer_size.x == 0.0f) && (use_child_window == false); // Will be set to false later if there are any Stretch column.
 
     // When not using a child window, WorkRect.Max will grow as we append contents.
     if (use_child_window)
@@ -601,10 +616,9 @@ static void TableSetupColumnFlags(ImGuiTable* table, ImGuiTableColumn* column, I
     // Sizing Policy
     if ((flags & ImGuiTableColumnFlags_WidthMask_) == 0)
     {
-        // FIXME-TABLE: clarify promotion to WidthAuto?
         const ImGuiTableFlags table_sizing_policy = (table->Flags & ImGuiTableFlags_SizingMask_);
         if (table_sizing_policy == ImGuiTableFlags_SizingFixedFit || table_sizing_policy == ImGuiTableFlags_SizingFixedSame)
-            flags |= ((table->Flags & ImGuiTableFlags_Resizable) && !(flags & ImGuiTableColumnFlags_NoResize)) ? ImGuiTableColumnFlags_WidthFixed : ImGuiTableColumnFlags_WidthAuto;
+            flags |= ImGuiTableColumnFlags_WidthFixed;
         else
             flags |= ImGuiTableColumnFlags_WidthStretch;
     }
@@ -614,7 +628,7 @@ static void TableSetupColumnFlags(ImGuiTable* table, ImGuiTableColumn* column, I
     }
     
     // Resize
-    if ((flags & ImGuiTableColumnFlags_WidthAuto) != 0 || (table->Flags & ImGuiTableFlags_Resizable) == 0)
+    if ((table->Flags & ImGuiTableFlags_Resizable) == 0)
         flags |= ImGuiTableColumnFlags_NoResize;
 
     // Sorting
@@ -707,7 +721,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
             table->IsSortSpecsDirty = true;
 
         // Auto-fit unsized columns
-        const bool start_auto_fit = (column->Flags & (ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_WidthAuto)) ? (column->WidthRequest < 0.0f) : (column->StretchWeight < 0.0f);
+        const bool start_auto_fit = (column->Flags & ImGuiTableColumnFlags_WidthFixed) ? (column->WidthRequest < 0.0f) : (column->StretchWeight < 0.0f);
         if (start_auto_fit)
             column->AutoFitQueue = column->CannotSkipItemsQueue = (1 << 3) - 1; // Fit for three frames
 
@@ -777,7 +791,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
         ImGuiTableColumn* column = &table->Columns[column_n];
 
         const bool column_is_resizable = (column->Flags & ImGuiTableColumnFlags_NoResize) == 0;
-        if (column->Flags & (ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_WidthAuto))
+        if (column->Flags & ImGuiTableColumnFlags_WidthFixed)
         {
             // Apply same widths policy
             float width_auto = column->WidthAuto;
@@ -786,7 +800,9 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
 
             // Apply automatic width
             // Latch initial size for fixed columns and update it constantly for auto-resizing column (unless clipped!)
-            if ((column->AutoFitQueue != 0x00) || ((column->Flags & ImGuiTableColumnFlags_WidthAuto) && column->IsVisibleX) || ((column->Flags & ImGuiTableColumnFlags_WidthFixed) && !column_is_resizable))
+            if (column->AutoFitQueue != 0x00)
+                column->WidthRequest = width_auto;
+            else if ((column->Flags & ImGuiTableColumnFlags_WidthFixed) && !column_is_resizable && (table->RequestOutputMaskByIndex & ((ImU64)1 << column_n)))
                 column->WidthRequest = width_auto;
 
             // FIXME-TABLE: Increase minimum size during init frame to avoid biasing auto-fitting widgets
@@ -823,7 +839,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
     }
     table->ColumnsEnabledFixedCount = (ImGuiTableColumnIdx)count_fixed;
 
-    // [Part 5] Apply final widths based on requested widths
+    // [Part 4] Apply final widths based on requested widths
     const ImRect work_rect = table->WorkRect;
     const float width_spacings = (table->OuterPaddingX * 2.0f) + (table->CellSpacingX1 + table->CellSpacingX2) * (table->ColumnsEnabledCount - 1);
     const float width_avail = ((table->Flags & ImGuiTableFlags_ScrollX) && table->InnerWidth == 0.0f) ? table->InnerClipRect.GetWidth() : work_rect.GetWidth();
@@ -854,7 +870,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
         table->ColumnsGivenWidth += column->WidthGiven;
     }
 
-    // [Part 6] Redistribute stretch remainder width due to rounding (remainder width is < 1.0f * number of Stretch column).
+    // [Part 5] Redistribute stretch remainder width due to rounding (remainder width is < 1.0f * number of Stretch column).
     // Using right-to-left distribution (more likely to match resizing cursor).
     if (width_remaining_for_stretched_columns >= 1.0f && !(table->Flags & ImGuiTableFlags_PreciseWidths))
         for (int order_n = table->ColumnsCount - 1; stretch_sum_weights > 0.0f && width_remaining_for_stretched_columns >= 1.0f && order_n >= 0; order_n--)
@@ -874,7 +890,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
     const ImRect mouse_hit_rect(table->OuterRect.Min.x, table->OuterRect.Min.y, table->OuterRect.Max.x, ImMax(table->OuterRect.Max.y, table->OuterRect.Min.y + table->LastOuterHeight));
     const bool is_hovering_table = ItemHoverable(mouse_hit_rect, 0);
 
-    // [Part 7] Setup final position, offset, skip/clip states and clipping rectangles, detect hovered column
+    // [Part 6] Setup final position, offset, skip/clip states and clipping rectangles, detect hovered column
     // Process columns in their visible orders as we are comparing the visible order and adjusting host_clip_rect while looping.
     int visible_n = 0;
     bool offset_x_frozen = (table->FreezeColumnsCount > 0);
@@ -994,13 +1010,13 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
         }
 
         if (visible_n < table->FreezeColumnsCount)
-            host_clip_rect.Min.x = ImMax(host_clip_rect.Min.x, column->MaxX + TABLE_BORDER_SIZE);
+            host_clip_rect.Min.x = ImClamp(column->MaxX + TABLE_BORDER_SIZE, host_clip_rect.Min.x, host_clip_rect.Max.x);
 
         offset_x += column->WidthGiven + table->CellSpacingX1 + table->CellSpacingX2 + table->CellPaddingX * 2.0f;
         visible_n++;
     }
 
-    // [Part 8] Detect/store when we are hovering the unused space after the right-most column (so e.g. context menus can react on it)
+    // [Part 7] Detect/store when we are hovering the unused space after the right-most column (so e.g. context menus can react on it)
     // Clear Resizable flag if none of our column are actually resizable (either via an explicit _NoResize flag, either
     // because of using _WidthAuto/_WidthStretch). This will hide the resizing option from the context menu.
     const float unused_x1 = ImMax(table->WorkRect.Min.x, table->Columns[table->RightMostEnabledColumn].ClipRect.Max.x);
@@ -1012,12 +1028,12 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
     if (has_resizable == false && (table->Flags & ImGuiTableFlags_Resizable))
         table->Flags &= ~ImGuiTableFlags_Resizable;
 
-    // [Part 9] Lock actual OuterRect/WorkRect right-most position.
+    // [Part 8] Lock actual OuterRect/WorkRect right-most position.
     // This is done late to handle the case of fixed-columns tables not claiming more widths that they need.
     // Because of this we are careful with uses of WorkRect and InnerClipRect before this point.
     if (table->RightMostStretchedColumn != -1)
-        table->IsOuterRectAutoFitX = false;
+        table->IsOuterRectMinFitX = false;
-    if (table->IsOuterRectAutoFitX)
+    if (table->IsOuterRectMinFitX)
     {
         table->OuterRect.Max.x = table->WorkRect.Max.x = unused_x1;
         table->InnerClipRect.Max.x = ImMin(table->InnerClipRect.Max.x, unused_x1);
@@ -1026,17 +1042,17 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
     table->BorderX1 = table->InnerClipRect.Min.x;// +((table->Flags & ImGuiTableFlags_BordersOuter) ? 0.0f : -1.0f);
     table->BorderX2 = table->InnerClipRect.Max.x;// +((table->Flags & ImGuiTableFlags_BordersOuter) ? 0.0f : +1.0f);
 
-    // [Part 10] Allocate draw channels and setup background cliprect
+    // [Part 9] Allocate draw channels and setup background cliprect
     TableSetupDrawChannels(table);
 
-    // [Part 11] Hit testing on borders
+    // [Part 10] Hit testing on borders
     if (table->Flags & ImGuiTableFlags_Resizable)
         TableUpdateBorders(table);
     table->LastFirstRowHeight = 0.0f;
     table->IsLayoutLocked = true;
     table->IsUsingHeaders = false;
 
-    // [Part 12] Context menu
+    // [Part 11] Context menu
     if (table->IsContextPopupOpen && table->InstanceCurrent == table->InstanceInteracted)
     {
         const ImGuiID context_menu_id = ImHashStr("##ContextMenu", 0, table->ID);
@@ -1162,20 +1178,30 @@ void    ImGui::EndTable()
     inner_window->DC.PrevLineSize = table->HostBackupPrevLineSize;
     inner_window->DC.CurrLineSize = table->HostBackupCurrLineSize;
     inner_window->DC.CursorMaxPos = table->HostBackupCursorMaxPos;
+    const float inner_content_max_y = table->RowPosY2;
+    IM_ASSERT(table->RowPosY2 == inner_window->DC.CursorPos.y);
     if (inner_window != outer_window)
-    {
+        inner_window->DC.CursorMaxPos.y = inner_content_max_y;
-        // Both OuterRect/InnerRect are valid from BeginTable
-        inner_window->DC.CursorMaxPos.y = table->RowPosY2;
-    }
     else if (!(flags & ImGuiTableFlags_NoHostExtendY))
-    {
+        table->OuterRect.Max.y = table->InnerRect.Max.y = ImMax(table->OuterRect.Max.y, inner_content_max_y); // Patch OuterRect/InnerRect height
-        // Patch OuterRect/InnerRect height
-        table->OuterRect.Max.y = table->InnerRect.Max.y = ImMax(table->OuterRect.Max.y, inner_window->DC.CursorPos.y);
-        inner_window->DC.CursorMaxPos.y = table->RowPosY2;
-    }
     table->WorkRect.Max.y = ImMax(table->WorkRect.Max.y, table->OuterRect.Max.y);
     table->LastOuterHeight = table->OuterRect.GetHeight();
 
+    // Setup inner scrolling range
+    // FIXME: This ideally should be done earlier, in BeginTable() SetNextWindowContentSize call, just like writing to inner_window->DC.CursorMaxPos.y,
+    // but since the later is likely to be impossible to do we'd rather update both axises together.
+    if (table->Flags & ImGuiTableFlags_ScrollX)
+    {
+        const float outer_padding_for_border = (table->Flags & ImGuiTableFlags_BordersOuterV) ? TABLE_BORDER_SIZE : 0.0f;
+        float max_pos_x = table->InnerWindow->DC.CursorMaxPos.x;
+        if (table->RightMostEnabledColumn != -1)
+            max_pos_x = ImMax(max_pos_x, table->Columns[table->RightMostEnabledColumn].WorkMaxX + table->CellPaddingX + table->OuterPaddingX - outer_padding_for_border);
+        if (table->ResizedColumn != -1)
+            max_pos_x = ImMax(max_pos_x, table->ResizeLockMinContentsX2);
+        table->InnerWindow->DC.CursorMaxPos.x = max_pos_x;
+    }
+
+    // Pop clipping rect
     if (!(flags & ImGuiTableFlags_NoClip))
         inner_window->DrawList->PopClipRect();
     inner_window->ClipRect = inner_window->DrawList->_ClipRectStack.back();
@@ -1208,7 +1234,13 @@ void    ImGui::EndTable()
     table->ColumnsAutoFitWidth = width_spacings + (table->CellPaddingX * 2.0f) * table->ColumnsEnabledCount;
     for (int column_n = 0; column_n < table->ColumnsCount; column_n++)
         if (table->EnabledMaskByIndex & ((ImU64)1 << column_n))
-            table->ColumnsAutoFitWidth += TableGetColumnWidthAuto(table, &table->Columns[column_n]);
+        {
+            ImGuiTableColumn* column = &table->Columns[column_n];
+            if ((column->Flags & ImGuiTableColumnFlags_WidthFixed) && !(column->Flags & ImGuiTableColumnFlags_NoResize))
+                table->ColumnsAutoFitWidth += column->WidthRequest;
+            else
+                table->ColumnsAutoFitWidth += TableGetColumnWidthAuto(table, column);
+        }
 
     // Update scroll
     if ((table->Flags & ImGuiTableFlags_ScrollX) == 0 && inner_window != outer_window)
@@ -1240,15 +1272,8 @@ void    ImGui::EndTable()
     IM_ASSERT_USER_ERROR(outer_window->DC.ItemWidthStack.Size >= table->HostBackupItemWidthStackSize, "Too many PopItemWidth!");
     PopID();
 
-    // Layout in outer window
+    // Restore window data that we modified
-    const float backup_outer_cursor_pos_x = outer_window->DC.CursorPos.x;
+    const ImVec2 backup_outer_max_pos = outer_window->DC.CursorMaxPos;
-    const float backup_outer_max_pos_x = outer_window->DC.CursorMaxPos.x;
-    const float backup_inner_max_pos_x = inner_window->DC.CursorMaxPos.x;
-    float max_pos_x = backup_inner_max_pos_x;
-    if (table->RightMostEnabledColumn != -1)
-        max_pos_x = ImMax(max_pos_x, table->Columns[table->RightMostEnabledColumn].MaxX);
-    if (table->ResizedColumn != -1)
-        max_pos_x = ImMax(max_pos_x, table->ResizeLockMinContentsX2);
     inner_window->WorkRect = table->HostBackupWorkRect;
     inner_window->ParentWorkRect = table->HostBackupParentWorkRect;
     inner_window->SkipItems = table->HostSkipItems;
@@ -1256,29 +1281,32 @@ void    ImGui::EndTable()
     outer_window->DC.ItemWidth = table->HostBackupItemWidth;
     outer_window->DC.ItemWidthStack.Size = table->HostBackupItemWidthStackSize;
     outer_window->DC.ColumnsOffset = table->HostBackupColumnsOffset;
-    const float outer_width = table->IsOuterRectAutoFitX ? table->WorkRect.GetWidth() : table->ColumnsAutoFitWidth;
+
+    // Layout in outer window
+    // (FIXME: To allow auto-fit and allow desirable effect of SameLine() we dissociate 'used' vs 'ideal' size by overriding
+    // CursorPosPrevLine and CursorMaxPos manually. That should be a more general layout feature, see same problem e.g. #3414)
+    const float outer_width = table->IsOuterRectMinFitX ? table->WorkRect.GetWidth() : table->ColumnsAutoFitWidth;
+    const float outer_height = table->OuterRect.GetHeight();
     if (inner_window != outer_window)
     {
         EndChild();
     }
     else
     {
-        ImVec2 item_size(outer_width, table->OuterRect.GetHeight());
+        ItemSize(ImVec2(outer_width, outer_height));
-        ItemSize(item_size);
+        outer_window->DC.CursorPosPrevLine.x = table->OuterRect.Max.x;
     }
 
-    // Override EndChild/ItemSize max extent with our own to enable auto-resize on the X axis when possible
+    // Override declared contents width to enable auto-resize on the X axis when possible.
     // FIXME-TABLE: This can be improved (e.g. for Fixed columns we don't want to auto AutoFitWidth? or propagate window auto-fit to table?)
     if (table->Flags & ImGuiTableFlags_ScrollX)
-    {
+        outer_window->DC.CursorMaxPos.x = ImMax(backup_outer_max_pos.x, table->OuterRect.Min.x + table->ColumnsGivenWidth + inner_window->ScrollbarSizes.x); // For outer scrolling
-        inner_window->DC.CursorMaxPos.x = max_pos_x; // Set contents width for scrolling
-        outer_window->DC.CursorMaxPos.x = ImMax(backup_outer_max_pos_x, backup_outer_cursor_pos_x + table->ColumnsGivenWidth + inner_window->ScrollbarSizes.x); // For scrolling
-    }
     else
-    {
+        outer_window->DC.CursorMaxPos.x = ImMax(backup_outer_max_pos.x, table->WorkRect.Min.x + outer_width); // For auto-fit
-        outer_window->DC.CursorMaxPos.x = ImMax(backup_outer_max_pos_x, table->WorkRect.Min.x + outer_width); // For auto-fit
+
-        outer_window->DC.CursorPosPrevLine.x = table->WorkRect.Max.x; // For consistent reaction to SameLine() // FIXME: Should be a feature of layout/ItemAdd
+    // Override declared contents height
-    }
+    if (inner_window == outer_window && !(flags & ImGuiTableFlags_NoHostExtendY))
+        outer_window->DC.CursorMaxPos.y = ImMax(outer_window->DC.CursorMaxPos.y, inner_content_max_y);
 
     // Save settings
     if (table->IsSettingsDirty)
@@ -1293,6 +1321,7 @@ void    ImGui::EndTable()
 }
 
 // See "COLUMN SIZING POLICIES" comments at the top of this file
+// If (init_width_or_weight <= 0.0f) it is ignored
 void ImGui::TableSetupColumn(const char* label, ImGuiTableColumnFlags flags, float init_width_or_weight, ImGuiID user_id)
 {
     ImGuiContext& g = *GImGui;
@@ -1320,8 +1349,6 @@ void ImGui::TableSetupColumn(const char* label, ImGuiTableColumnFlags flags, flo
     flags = column->Flags;
 
     // Initialize defaults
-    if (flags & ImGuiTableColumnFlags_WidthStretch)
-        IM_ASSERT(init_width_or_weight != 0.0f && "Need to provide a valid weight!");
     column->InitStretchWeightOrWidth = init_width_or_weight;
     if (table->IsInitializing)
     {
@@ -1436,7 +1463,7 @@ ImRect ImGui::TableGetCellBgRect(const ImGuiTable* table, int column_n)
 // Return the resizing ID for the right-side of the given column.
 ImGuiID ImGui::TableGetColumnResizeID(const ImGuiTable* table, int column_n, int instance_no)
 {
-    IM_ASSERT(column_n < table->ColumnsCount);
+    IM_ASSERT(column_n >= 0 && column_n < table->ColumnsCount);
     ImGuiID id = table->ID + 1 + (instance_no * table->ColumnsCount) + column_n;
     return id;
 }
@@ -1451,17 +1478,17 @@ int ImGui::TableGetHoveredColumn()
     return (int)table->HoveredColumnBody;
 }
 
-void ImGui::TableSetBgColor(ImGuiTableBgTarget bg_target, ImU32 color, int column_n)
+void ImGui::TableSetBgColor(ImGuiTableBgTarget target, ImU32 color, int column_n)
 {
     ImGuiContext& g = *GImGui;
     ImGuiTable* table = g.CurrentTable;
-    IM_ASSERT(bg_target != ImGuiTableBgTarget_None);
+    IM_ASSERT(target != ImGuiTableBgTarget_None);
 
     if (color == IM_COL32_DISABLE)
         color = 0;
 
     // We cannot draw neither the cell or row background immediately as we don't know the row height at this point in time.
-    switch (bg_target)
+    switch (target)
     {
     case ImGuiTableBgTarget_CellBg:
     {
@@ -1484,7 +1511,7 @@ void ImGui::TableSetBgColor(ImGuiTableBgTarget bg_target, ImU32 color, int colum
         if (table->RowPosY1 > table->InnerClipRect.Max.y) // Discard
             return;
         IM_ASSERT(column_n == -1);
-        int bg_idx = (bg_target == ImGuiTableBgTarget_RowBg1) ? 1 : 0;
+        int bg_idx = (target == ImGuiTableBgTarget_RowBg1) ? 1 : 0;
         table->RowBgColor[bg_idx] = color;
         break;
     }
@@ -2324,7 +2351,7 @@ void ImGui::TableMergeDrawChannels(ImGuiTable* table)
 void ImGui::TableDrawBorders(ImGuiTable* table)
 {
     ImGuiWindow* inner_window = table->InnerWindow;
-    if (inner_window->Hidden || !table->HostClipRect.Overlaps(table->InnerClipRect))
+    if (!table->OuterWindow->ClipRect.Overlaps(table->OuterRect))
         return;
 
     ImDrawList* inner_drawlist = inner_window->DrawList;
@@ -2335,7 +2362,7 @@ void ImGui::TableDrawBorders(ImGuiTable* table)
     const float border_size = TABLE_BORDER_SIZE;
     const float draw_y1 = table->InnerRect.Min.y;
     const float draw_y2_body = table->InnerRect.Max.y;
-    const float draw_y2_head = table->IsUsingHeaders ? ((table->FreezeRowsCount >= 1 ? table->OuterRect.Min.y : table->WorkRect.Min.y) + table->LastFirstRowHeight) : draw_y1;
+    const float draw_y2_head = table->IsUsingHeaders ? ImMin(table->InnerRect.Max.y, (table->FreezeRowsCount >= 1 ? table->InnerRect.Min.y : table->WorkRect.Min.y) + table->LastFirstRowHeight) : draw_y1;
     if (table->Flags & ImGuiTableFlags_BordersInnerV)
     {
         for (int order_n = 0; order_n < table->ColumnsCount; order_n++)
@@ -2353,7 +2380,7 @@ void ImGui::TableDrawBorders(ImGuiTable* table)
             if (column->MaxX > table->InnerClipRect.Max.x && !is_resized)
                 continue;
             if (column->NextEnabledColumn == -1 && !is_resizable)
-                if ((table->Flags & ImGuiTableFlags_SizingMask_) != ImGuiTableFlags_SizingFixedSame || table->IsOuterRectAutoFitX)
+                if ((table->Flags & ImGuiTableFlags_SizingMask_) != ImGuiTableFlags_SizingFixedSame || table->IsOuterRectMinFitX)
                     continue;
             if (column->MaxX <= column->ClipRect.Min.x) // FIXME-TABLE FIXME-STYLE: Assume BorderSize==1, this is problematic if we want to increase the border size..
                 continue;
@@ -3367,7 +3394,7 @@ void ImGui::DebugNodeTable(ImGuiTable* table)
             "WidthGiven: %.1f, Request/Auto: %.1f/%.1f, StretchWeight: %.3f (%.1f%%)\n"
             "MinX: %.1f, MaxX: %.1f (%+.1f), ClipRect: %.1f to %.1f (+%.1f)\n"
             "ContentWidth: %.1f,%.1f, HeadersUsed/Ideal %.1f/%.1f\n"
-            "Sort: %d%s, UserID: 0x%08X, Flags: 0x%04X: %s%s%s%s..",
+            "Sort: %d%s, UserID: 0x%08X, Flags: 0x%04X: %s%s%s..",
             n, column->DisplayOrder, name, column->MinX - table->WorkRect.Min.x, column->MaxX - table->WorkRect.Min.x, (n < table->FreezeColumnsRequest) ? " (Frozen)" : "",
             column->IsEnabled, column->IsVisibleX, column->IsVisibleY, column->IsRequestOutput, column->IsSkipItems, column->DrawChannelFrozen, column->DrawChannelUnfrozen,
             column->WidthGiven, column->WidthRequest, column->WidthAuto, column->StretchWeight, column->StretchWeight > 0.0f ? (column->StretchWeight / sum_weights) * 100.0f : 0.0f,
@@ -3376,7 +3403,6 @@ void ImGui::DebugNodeTable(ImGuiTable* table)
             column->SortOrder, (column->SortDirection == ImGuiSortDirection_Ascending) ? " (Asc)" : (column->SortDirection == ImGuiSortDirection_Descending) ? " (Des)" : "", column->UserID, column->Flags,
             (column->Flags & ImGuiTableColumnFlags_WidthStretch) ? "WidthStretch " : "",
             (column->Flags & ImGuiTableColumnFlags_WidthFixed) ? "WidthFixed " : "",
-            (column->Flags & ImGuiTableColumnFlags_WidthAuto) ? "WidthAuto " : "",
             (column->Flags & ImGuiTableColumnFlags_NoResize) ? "NoResize " : "");
         Bullet();
         Selectable(buf);

imgui_widgets.cpp

@@ -5908,21 +5908,25 @@ bool ImGui::CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags)
     return TreeNodeBehavior(window->GetID(label), flags | ImGuiTreeNodeFlags_CollapsingHeader, label);
 }
 
-bool ImGui::CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags flags)
+// p_visible == NULL                        : regular collapsing header
+// p_visible != NULL && *p_visible == true  : show a small close button on the corner of the header, clicking the button will set *p_visible = false
+// p_visible != NULL && *p_visible == false : do not show the header at all
+// Do not mistake this with the Open state of the header itself, which you can adjust with SetNextItemOpen() or ImGuiTreeNodeFlags_DefaultOpen.
+bool ImGui::CollapsingHeader(const char* label, bool* p_visible, ImGuiTreeNodeFlags flags)
 {
     ImGuiWindow* window = GetCurrentWindow();
     if (window->SkipItems)
         return false;
 
-    if (p_open && !*p_open)
+    if (p_visible && !*p_visible)
         return false;
 
     ImGuiID id = window->GetID(label);
     flags |= ImGuiTreeNodeFlags_CollapsingHeader;
-    if (p_open)
+    if (p_visible)
         flags |= ImGuiTreeNodeFlags_AllowItemOverlap | ImGuiTreeNodeFlags_ClipLabelForTrailingButton;
     bool is_open = TreeNodeBehavior(id, flags, label);
-    if (p_open != NULL)
+    if (p_visible != NULL)
     {
         // Create a small overlapping close button
         // FIXME: We can evolve this into user accessible helpers to add extra buttons on title bars, headers, etc.
@@ -5934,7 +5938,7 @@ bool ImGui::CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags
         float button_y = window->DC.LastItemRect.Min.y;
         ImGuiID close_button_id = GetIDWithSeed("#CLOSE", NULL, id);
         if (CloseButton(close_button_id, ImVec2(button_x, button_y)))
-            *p_open = false;
+            *p_visible = false;
         last_item_backup.Restore();
     }
 
@@ -6239,6 +6243,11 @@ bool ImGui::ListBox(const char* label, int* current_item, bool (*items_getter)(v
 // - PlotLines()
 // - PlotHistogram()
 //-------------------------------------------------------------------------
+// Plot/Graph widgets are not very good.
+// Consider writing your own, or using a third-party one, see:
+// - ImPlot https://github.com/epezent/implot
+// - others https://github.com/ocornut/imgui/wiki/Useful-Widgets
+//-------------------------------------------------------------------------
 
 int ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset, const char* overlay_text, float scale_min, float scale_max, ImVec2 frame_size)
 {