Merge branch 'viewport' into docking

# Conflicts:
#	imgui_internal.h
#	imgui_widgets.cpp

imgui.cpp

@@ -375,6 +375,8 @@ CODE
  - 2018/XX/XX (1.XX) - removed io.DisplayVisibleMin, io.DisplayVisibleMax settings (they were used to clip within the (0,0)..DisplaySize range, I don't know of anyone using it)
 
 
+ - 2019/01/06 (1.67) - renamed io.InputCharacters[], marked internal as was always intended. Please don't access directly, and use AddInputCharacter() instead!
+ - 2019/01/06 (1.67) - renamed ImFontAtlas::GlyphRangesBuilder to ImFontGlyphRangesBuilder. Keep redirection typedef (will obsolete).
  - 2018/12/10 (1.67) - renamed io.ConfigResizeWindowsFromEdges to io.ConfigWindowsResizeFromEdges as we are doing a large pass on configuration flags.
  - 2018/10/12 (1.66) - renamed misc/stl/imgui_stl.* to misc/cpp/imgui_stdlib.* in prevision for other C++ helper files.
  - 2018/09/28 (1.66) - renamed SetScrollHere() to SetScrollHereY(). Kept redirection function (will obsolete).
@@ -391,6 +393,9 @@ CODE
  - 2018/08/01 (1.63) - renamed io.OptCursorBlink to io.ConfigCursorBlink [-> io.ConfigInputTextCursorBlink in 1.65], io.OptMacOSXBehaviors to ConfigMacOSXBehaviors for consistency.
  - 2018/07/22 (1.63) - changed ImGui::GetTime() return value from float to double to avoid accumulating floating point imprecisions over time.
  - 2018/07/08 (1.63) - style: renamed ImGuiCol_ModalWindowDarkening to ImGuiCol_ModalWindowDimBg for consistency with other features. Kept redirection enum (will obsolete).
+ - 2018/06/08 (1.62) - examples: the imgui_impl_xxx files have been split to separate platform (Win32, Glfw, SDL2, etc.) from renderer (DX11, OpenGL, Vulkan,  etc.).
+                       old binding will still work as is, however prefer using the separated bindings as they will be updated to be multi-viewport conformant.
+                       when adopting new bindings follow the main.cpp code of your preferred examples/ folder to know which functions to call.
  - 2018/06/06 (1.62) - renamed GetGlyphRangesChinese() to GetGlyphRangesChineseFull() to distinguish other variants and discourage using the full set.
  - 2018/06/06 (1.62) - TreeNodeEx()/TreeNodeBehavior(): the ImGuiTreeNodeFlags_CollapsingHeader helper now include the ImGuiTreeNodeFlags_NoTreePushOnOpen flag. See Changelog for details. 
  - 2018/05/03 (1.61) - DragInt(): the default compile-time format string has been changed from "%.0f" to "%d", as we are not using integers internally any more.
@@ -439,6 +444,7 @@ CODE
                        removed the IsItemRectHovered()/IsWindowRectHovered() names introduced in 1.51 since they were merely more consistent names for the two functions we are now obsoleting.
  - 2017/10/17 (1.52) - marked the old 5-parameters version of Begin() as obsolete (still available). Use SetNextWindowSize()+Begin() instead!
  - 2017/10/11 (1.52) - renamed AlignFirstTextHeightToWidgets() to AlignTextToFramePadding(). Kept inline redirection function (will obsolete).
+ - 2017/09/26 (1.52) - renamed ImFont::Glyph to ImFontGlyph. Keep redirection typedef (will obsolete).
  - 2017/09/25 (1.52) - removed SetNextWindowPosCenter() because SetNextWindowPos() now has the optional pivot information to do the same and more. Kept redirection function (will obsolete).
  - 2017/08/25 (1.52) - io.MousePos needs to be set to ImVec2(-FLT_MAX,-FLT_MAX) when mouse is unavailable/missing. Previously ImVec2(-1,-1) was enough but we now accept negative mouse coordinates. In your binding if you need to support unavailable mouse, make sure to replace "io.MousePos = ImVec2(-1,-1)" with "io.MousePos = ImVec2(-FLT_MAX,-FLT_MAX)".
  - 2017/08/22 (1.51) - renamed IsItemHoveredRect() to IsItemRectHovered(). Kept inline redirection function (will obsolete). -> (1.52) use IsItemHovered(ImGuiHoveredFlags_RectOnly)!
@@ -830,7 +836,7 @@ CODE
 
       // Or create your own custom ranges (e.g. for a game you can feed your entire game script and only build the characters the game need)
       ImVector<ImWchar> ranges;
-      ImFontAtlas::GlyphRangesBuilder builder;
+      ImFontGlyphRangesBuilder builder;
       builder.AddText("Hello world");                        // Add a string (here "Hello world" contains 7 unique characters)
       builder.AddChar(0x7262);                               // Add a specific character
       builder.AddRanges(io.Fonts->GetGlyphRangesJapanese()); // Add one of the default ranges
@@ -1198,22 +1204,23 @@ ImGuiIO::ImGuiIO()
 // - on Windows you can get those using ToAscii+keyboard state, or via the WM_CHAR message
 void ImGuiIO::AddInputCharacter(ImWchar c)
 {
-    const int n = ImStrlenW(InputCharacters);
-    if (n + 1 < IM_ARRAYSIZE(InputCharacters))
-    {
-        InputCharacters[n] = c;
-        InputCharacters[n+1] = '\0';
-    }
+    InputQueueCharacters.push_back(c);
 }
 
 void ImGuiIO::AddInputCharactersUTF8(const char* utf8_chars)
 {
-    // We can't pass more wchars than ImGuiIO::InputCharacters[] can hold so don't convert more
-    const int wchars_buf_len = sizeof(ImGuiIO::InputCharacters) / sizeof(ImWchar);
-    ImWchar wchars[wchars_buf_len];
-    ImTextStrFromUtf8(wchars, wchars_buf_len, utf8_chars, NULL);
-    for (int i = 0; i < wchars_buf_len && wchars[i] != 0; i++)
-        AddInputCharacter(wchars[i]);
+    while (*utf8_chars != 0)
+    {
+        unsigned int c = 0;
+        utf8_chars += ImTextCharFromUtf8(&c, utf8_chars, NULL);
+        if (c > 0 && c <= 0xFFFF)
+            InputQueueCharacters.push_back((ImWchar)c);
+    }
+}
+
+void ImGuiIO::ClearInputCharacters()
+{
+    InputQueueCharacters.resize(0);
 }
 
 //-----------------------------------------------------------------------------
@@ -2586,6 +2593,7 @@ void ImGui::SetActiveID(ImGuiID id, ImGuiWindow* window)
     }
 }
 
+// FIXME-NAV: The existence of SetNavID/SetNavIDWithRectRel/SetFocusID is incredibly messy and confusing and needs some explanation or refactoring.
 void ImGui::SetFocusID(ImGuiID id, ImGuiWindow* window)
 {
     ImGuiContext& g = *GImGui;
@@ -3976,7 +3984,7 @@ void ImGui::EndFrame()
 
     // Clear Input data for next frame
     g.IO.MouseWheel = g.IO.MouseWheelH = 0.0f;
-    memset(g.IO.InputCharacters, 0, sizeof(g.IO.InputCharacters));
+    g.IO.InputQueueCharacters.resize(0);
     memset(g.IO.NavInputs, 0, sizeof(g.IO.NavInputs));
 }
 
@@ -7169,7 +7177,7 @@ void ImGui::OpenPopupEx(ImGuiID id)
     popup_ref.OpenPopupPos = NavCalcPreferredRefPos();
     popup_ref.OpenMousePos = IsMousePosValid(&g.IO.MousePos) ? g.IO.MousePos : popup_ref.OpenPopupPos;
 
-    //printf("[%05d] OpenPopupEx(0x%08X)\n", g.FrameCount, id);
+    //IMGUI_DEBUG_LOG("OpenPopupEx(0x%08X)\n", g.FrameCount, id);
     if (g.OpenPopupStack.Size < current_stack_size + 1)
     {
         g.OpenPopupStack.push_back(popup_ref);
@@ -8677,7 +8685,7 @@ static void ImGui::NavUpdate()
     ImGuiContext& g = *GImGui;
     g.IO.WantSetMousePos = false;
 #if 0
-    if (g.NavScoringCount > 0) printf("[%05d] NavScoringCount %d for '%s' layer %d (Init:%d, Move:%d)\n", g.FrameCount, g.NavScoringCount, g.NavWindow ? g.NavWindow->Name : "NULL", g.NavLayer, g.NavInitRequest || g.NavInitResultId != 0, g.NavMoveRequest);
+    if (g.NavScoringCount > 0) IMGUI_DEBUG_LOG("NavScoringCount %d for '%s' layer %d (Init:%d, Move:%d)\n", g.FrameCount, g.NavScoringCount, g.NavWindow ? g.NavWindow->Name : "NULL", g.NavLayer, g.NavInitRequest || g.NavInitResultId != 0, g.NavMoveRequest);
 #endif
 
     // Set input source as Gamepad when buttons are pressed before we map Keyboard (some features differs when used with Gamepad vs Keyboard)