Merge branch 'master' into viewport

CHANGELOG.txt

@@ -46,6 +46,8 @@ Various internal refactors have also been done, as part of the navigation work a
 Breaking Changes:
 (IN PROGRESS, WILL ADD TO THIS LIST AS WE WORK ON 1.60)
 
+ - Fonts: changed ImFont::DisplayOffset.y to defaults to 0 instead of +1. Fixed vertical rounding of Ascent/Descent to match TrueType renderer. 
+   If you were adding or subtracting to ImFont::DisplayOffset check if your fonts are correctly aligned vertically. (#1619)
  - BeginDragDropSource(): temporarily removed the optional mouse_button=0 parameter because it is not really usable in many situations at the moment. 
  - Obsoleted the io.RenderDrawListsFn callback, you can call your graphics engine render function after ImGui::Render(). Use ImGui::GetDrawData() to retrieve the ImDrawData* to display.
  - Reorganized context handling to be more explicit,
@@ -104,14 +106,16 @@ Other Changes:
 - Popup: Better handling of user mistakenly calling OpenPopup() every frame (with reopen_existing option). The error will now be more visible and easier to understand. (#1497)
 - Popup: BeginPopup(): Exposed extra_flags parameter that are passed through to Begin(). (#1533)
 - Popup: BeginPopupModal: fixed the conditional test for SetNextWindowPos() which was polling the wrong window, which in practice made the test succeed all the time.
-- Tooltip: BeginTooltip() sets NoInputs flag.
+- Tooltip: BeginTooltip() sets ImGuiWindowFlags_NoInputs flag.
 - Scrollbar: Fixed ScrollbarY enable test after ScrollbarX has been enabled being a little off (small regression from Nov 2017). (#1574)
 - Scrollbar: Fixed ScrollbarX enable test subtracting WindowPadding.x (this has been there since the addition of horizontal scroll bar!).
 - Columns: Clear offsets data when columns count changed. (#1525)
 - Columns: Fixed a memory leak of ImGuiColumnsSet's Columns vector. (#1529) [@unprompted]
+- Columns: Fixed resizing a window very small breaking some columns positioning (broken in 1.53).
+- Columns: The available column extent takes consideration of the right-most clipped pixel, so the right-most column may look a little wider but will contain the same amount of visible contents.
 - MenuBar: Fixed menu bar pushing a clipping rect outside of its allocated bound (usually unnoticeable).
 - TreeNode: nodes with the ImGuiTreeNodeFlags_Leaf flag correctly disable highlight when DragDrop is active. (#143, #581)
-- Drag and Drop: Increased payload type string to 12 characters instead of 8. (#143)
+- Drag and Drop: Increased payload type string to 32 characters instead of 8. (#143)
 - Drag and Drop: TreeNode as drop target displays rectangle over full frame. (#1597, #143)
 - DragFloat: Fix/workaround for backends which do not preserve a valid mouse position when dragged out of bounds. (#1559)
 - Slider, Combo: Use ImGuiCol_FrameBgHovered color when hovered. (#1456) [@stfx]
@@ -119,6 +123,12 @@ Other Changes:
 - Combo: BeginCombo(): Added ImGuiComboFlags_NoPreview to disable the preview and only display a square arrow button. 
 - Combo: Arrow button isn't displayed over frame background so its blended color matches other buttons. Left side of the button isn't rounded.
 - PlotLines: plot a flat line if scale_min==scale_max. (#1621)
+- Fonts: Changed DisplayOffset.y to defaults to 0 instead of +1. Fixed rounding of Ascent/Descent to match TrueType renderer. 
+  If you were adding or subtracting to ImFont::DisplayOffset check if your fonts are correctly aligned vertically. (#1619)
+- Fonts: Updated stb_truetype from 1.14 to stb_truetype 1.19. (w/ include fix from some platforms #1622)
+- Fonts: Added optional FreeType rasterizer in misc/freetype. Moved from imgui_club repo. (#618) [@Vuhdo, @mikesart, @ocornut]
+- Fonts: Moved extra_fonts/ to misc/fonts/.
+- ImFontAtlas: Fixed cfg.MergeMode not reusing existing glyphs if available (always overwrote).
 - ImFontAtlas: Handle stb_truetype stbtt_InitFont() and stbtt_PackBegin() possible failures more gracefully, GetTexDataAsRGBA32() won't crash during conversion. (#1527)
 - ImFontAtlas: Moved mouse cursor data out of ImGuiContext, fix drawing them with multiple contexts. Also remove the last remaining undesirable dependency on ImGui in imgui_draw.cpp. (#939)
 - ImFontAtlas: Added ImFontAtlasFlags_NoPowerOfTwoHeight flag to disable padding font height to nearest power of two. (#1613)
@@ -134,18 +144,17 @@ Other Changes:
 - Misc: Updated stb_rect_pack from 0.10 to 0.11 (minor changes).
 - Misc: Added ImGuiConfigFlags_IsSRGB and ImGuiConfigFlags_IsTouchScreen user flags (for io.ConfigFlags). 
   (Those flags are not used by ImGui itself, they only exists to make it easy for the engine/back-end to pass information to the application in a standard manner.)
-- Fonts: Updated stb_truetype from 1.14 to stb_truetype 1.19. (w/ include fix from some platforms #1622)
-- Fonts: Added optional FreeType rasterizer in misc/freetype. Moved from imgui_club repo. (#618) [@Vuhdo, @mikesart, @ocornut]
-- Fonts: Moved extra_fonts/ to misc/fonts/.
+- Metrics: Added display of Columns state.
 - Demo: Improved Selectable() examples. (#1528)
 - Demo: Tweaked the Child demos, added a menu bar to the second child to test some navigation functions.
 - Demo: Console: Using ImGuiCol_Text to be more friendly to color changes. 
 - Demo: Using IM_COL32() instead of ImColor() in ImDrawList centric contexts. Trying to phase out use of the ImColor helper whenever possible.
 - Examples: Files in examples/ now include their own changelog so it is easier to occasionally update your bindings if needed.
 - Examples: Using Dark theme by default. (#707). Tweaked demo code.
-- Examples: Added support for horizontal mouse wheel for API that allows it. (#1463)
+- Examples: Added support for horizontal mouse wheel for API that allows it. (#1463) [@tseeker]
 - Examples: DirectX12: Added DirectX 12 example. (#301) [@jdm3]
-- Examples: OpenGL3+GLFW,SDL: Changed GLSL shader version to 150 (#1466, #1504).
+- Examples: OpenGL3+GLFW,SDL: Changed GLSL shader version from 330 to 150. (#1466, #1504)
+- Examples: OpenGL3+GLFW,SDL: Added a way to override the GLSL version string in the Init function. (#1466, #1504).
 - Examples: OpenGL3+GLFW,SDL: Creating VAO in the render function so it can be more easily used by multiple shared OpenGL contexts. (#1217)
 - Examples: OpenGL3+GLFW: Using 3.2 context instead of 3.3. (#1466)
 - Examples: OpenGL: Setting up glPixelStorei() explicitly before uploading texture.
@@ -264,7 +273,7 @@ Other Changes:
 - NewFrame(): using literal strings in the most-frequently firing IM_ASSERT expressions to increase the odd of programmers seeing them (especially those who don't use a debugger).
 - NewFrame() now asserts if neither Render or EndFrame have been called. Exposed EndFrame(). Made it legal to call EndFrame() more than one. (#1423)
 - ImGuiStorage: Added BuildSortByKey() helper to rebuild storage from stratch.
-- ImFont: Added GetDebugName() helper. 
+- ImFont: Added GetDebugName() helper.
 - ImFontAtlas: Added missing Thai punctuation in the GetGlyphRangesThai() ranges. (#1396) [@nProtect]
 - ImDrawList: Removed 'bool anti_aliased = true' final parameter of ImDrawList::AddPolyline() and ImDrawList::AddConvexPolyFilled(). Anti-aliasing is controlled via the regular style.AntiAliased flags.
 - ImDrawList: Added ImDrawList::AddImageRounded() helper. (#845) [@thedmd] 

README.md

@@ -145,8 +145,7 @@ Frameworks:
 - Unreal Engine 4: [segross/UnrealImGui](https://github.com/segross/UnrealImGui) or [sronsse/UnrealEngine_ImGui](https://github.com/sronsse/UnrealEngine_ImGui)
 - SFML: [imgui-sfml](https://github.com/EliasD/imgui-sfml) or [imgui-backends](https://github.com/Mischa-Alff/imgui-backends)
 
-For other bindings: see [this page](https://github.com/ocornut/imgui/wiki/Links/).
-Please contact me with the Issues tracker or Twitter to fix/update this list.
+For other bindings: see [this page](https://github.com/ocornut/imgui/wiki/Links/). Also see [wiki](https://github.com/ocornut/imgui/wiki) for a few other links and ideas. Contact me if you would like to add to those lists.
 
 Roadmap
 -------

TODO.txt

@@ -212,7 +212,10 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - pie menus patterns (#434)
  - markup: simple markup language for color change? (#902)
 
- - font: better vertical centering (based e.g on height of lowercase 'x'?). currently Roboto-Medium size 16 px isn't currently centered.
+!- font: need handling of missing glyphs by not packing/rasterizing glyph 0 of a given font.
+ - font: MergeMode: flags to select overwriting or not.
+ - font: MergeMode: duplicate glyphs are stored in the atlas texture which is suboptimal.
+ - font: better vertical centering (based e.g on height of lowercase 'x'?). currently Roboto-Medium size 16 px isn't currently centered. (#1619)
  - font: free the Alpha buffer if user only requested RGBA.
 !- font: better CalcTextSizeA() API, at least for simple use cases. current one is horrible (perhaps have simple vs extended versions).
  - font: enforce monospace through ImFontConfig (for icons?) + create dual ImFont output from same input, reusing rasterized data but with different glyphs/AdvanceX

imgui.cpp

@@ -19,7 +19,7 @@
    - Read first
    - How to update to a newer version of Dear ImGui
    - Getting started with integrating Dear ImGui in your code/engine
-   - Using gamepad/keyboard navigation [BETA]
+   - Using gamepad/keyboard navigation controls [BETA]
  - API BREAKING CHANGES (read me when you update!)
  - ISSUES & TODO LIST
  - FREQUENTLY ASKED QUESTIONS (FAQ), TIPS
@@ -76,7 +76,8 @@
    - ESCAPE to revert text to its original value.
    - You can apply arithmetic operators +,*,/ on numerical values. Use +- to subtract (because - would set a negative value!)
    - Controls are automatically adjusted for OSX to match standard OSX text editing operations.
- - Gamepad navigation: see suggested mappings in imgui.h ImGuiNavInput_ + download PNG/PSD at goo.gl/9LgVZW.
+ - General Keyboard controls: enable with ImGuiConfigFlags_NavEnableKeyboard.
+ - General Gamepad controls: enable with ImGuiConfigFlags_NavEnableGamepad. See suggested mappings in imgui.h ImGuiNavInput_ + download PNG/PSD at goo.gl/9LgVZW.
 
 
  PROGRAMMER GUIDE
@@ -210,9 +211,9 @@
    They tell you if ImGui intends to use your inputs. So for example, if 'io.WantCaptureMouse' is set you would typically want to hide 
    mouse inputs from the rest of your application. Read the FAQ below for more information about those flags.
 
- USING GAMEPAD/KEYBOARD NAVIGATION [BETA]
+ USING GAMEPAD/KEYBOARD NAVIGATION CONTROLS [BETA]
 
- - Ask questions and report issues at https://github.com/ocornut/imgui/issues/787
+ - The gamepad/keyboard navigation is in Beta. Ask questions and report issues at https://github.com/ocornut/imgui/issues/787
  - The initial focus was to support game controllers, but keyboard is becoming increasingly and decently usable.
  - Keyboard:
     - Set io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard to enable. NewFrame() will automatically fill io.NavInputs[] based on your io.KeyDown[] + io.KeyMap[] arrays.
@@ -227,13 +228,13 @@
     - See 'enum ImGuiNavInput_' in imgui.h for a description of inputs. For each entry of io.NavInputs[], set the following values:
          0.0f= not held. 1.0f= fully held. Pass intermediate 0.0f..1.0f values for analog triggers/sticks.
     - We uses a simple >0.0f test for activation testing, and won't attempt to test for a dead-zone.
-      Your code will probably need to transform your raw inputs (such as e.g. remapping your 0.2..0.9 raw input range to 0.0..1.0 imgui range, maybe a power curve, etc.).
+      Your code will probably need to transform your raw inputs (such as e.g. remapping your 0.2..0.9 raw input range to 0.0..1.0 imgui range, etc.).
     - You can download PNG/PSD files depicting the gamepad controls for common controllers at: goo.gl/9LgVZW.
     - If you need to share inputs between your game and the imgui parts, the easiest approach is to go all-or-nothing, with a buttons combo to toggle the target.
       Please reach out if you think the game vs navigation input sharing could be improved.
  - Mouse:
     - PS4 users: Consider emulating a mouse cursor with DualShock4 touch pad or a spare analog stick as a mouse-emulation fallback.
-    - Consoles/Tablet/Phone users: Consider using a Synergy 1.x server (on your PC) + uSynergy.c (in your console/tablet/phone app) to share your PC mouse/keyboard.
+    - Consoles/Tablet/Phone users: Consider using a Synergy 1.x server (on your PC) + uSynergy.c (on your console/tablet/phone app) to share your PC mouse/keyboard.
     - On a TV/console system where readability may be lower or mouse inputs may be awkward, you may want to set the ImGuiConfigFlags_NavMoveMouse flag.
       Enabling ImGuiConfigFlags_NavMoveMouse instructs dear imgui to move your mouse cursor along with navigation movements.
       When enabled, the NewFrame() function may alter 'io.MousePos' and set 'io.WantMoveMouse' to notify you that it wants the mouse cursor to be moved.
@@ -250,6 +251,7 @@
  Here is a change-log of API breaking changes, if you are using one of the functions listed, expect to have to fix some code.
  Also read releases logs https://github.com/ocornut/imgui/releases for more details.
 
+ - 2018/03/08 (1.60) - Changed ImFont::DisplayOffset.y to default to 0 instead of +1. Fixed rounding of Ascent/Descent to match TrueType renderer. If you were adding or subtracting to ImFont::DisplayOffset check if your fonts are correctly aligned vertically.
  - 2018/03/03 (1.60) - Renamed ImGuiStyleVar_Count_ to ImGuiStyleVar_COUNT and ImGuiMouseCursor_Count_ to ImGuiMouseCursor_COUNT for consistency with other public enums.
  - 2018/02/27 (1.XX) - removed io.DisplayVisibleMin, io.DisplayVisibleMax settings (it was used to clip within the DisplayPos..DisplayPos+Size range, I don't know of anyone using it)
  - 2018/02/18 (1.60) - BeginDragDropSource(): temporarily removed the optional mouse_button=0 parameter because it is not really usable in many situations at the moment.

imgui.h

@@ -462,7 +462,7 @@ namespace ImGui
     // Drag and Drop
     // [BETA API] Missing Demo code. API may evolve.
     IMGUI_API bool          BeginDragDropSource(ImGuiDragDropFlags flags = 0);                                      // call when the current item is active. If this return true, you can call SetDragDropPayload() + EndDragDropSource()
-    IMGUI_API bool          SetDragDropPayload(const char* type, const void* data, size_t size, ImGuiCond cond = 0);// type is a user defined string of maximum 12 characters. Strings starting with '_' are reserved for dear imgui internal types. Data is copied and held by imgui.
+    IMGUI_API bool          SetDragDropPayload(const char* type, const void* data, size_t size, ImGuiCond cond = 0);// type is a user defined string of maximum 32 characters. Strings starting with '_' are reserved for dear imgui internal types. Data is copied and held by imgui.
     IMGUI_API void          EndDragDropSource();                                                                    // only call EndDragDropSource() if BeginDragDropSource() returns true!
     IMGUI_API bool          BeginDragDropTarget();                                                                  // call after submitting an item that may receive an item. If this returns true, you can call AcceptDragDropPayload() + EndDragDropTarget()
     IMGUI_API const ImGuiPayload* AcceptDragDropPayload(const char* type, ImGuiDragDropFlags flags = 0);            // accept contents of a given type. If ImGuiDragDropFlags_AcceptBeforeDelivery is set you can peek into the payload before the mouse button is released.
@@ -758,7 +758,7 @@ enum ImGuiNavInput_
     ImGuiNavInput_TweakFast,     // faster tweaks                                // e.g. R1 or R2 (PS4), RB or RT (Xbox), R or ZL (Switch)
 
     // [Internal] Don't use directly! This is used internally to differentiate keyboard from gamepad inputs for behaviors that require to differentiate them.
-    // Keyboard behavior that have no corresponding gamepad mapping (e.g. CTRL+TAB) may be directly reading from io.KeyDown[] instead of io.NavInputs[].
+    // Keyboard behavior that have no corresponding gamepad mapping (e.g. CTRL+TAB) will be directly reading from io.KeyDown[] instead of io.NavInputs[].
     ImGuiNavInput_KeyMenu_,      // toggle menu                                  // = io.KeyAlt
     ImGuiNavInput_KeyLeft_,      // move left                                    // = Arrow keys
     ImGuiNavInput_KeyRight_,     // move right
@@ -1400,7 +1400,7 @@ struct ImGuiPayload
     ImGuiID         SourceId;           // Source item id
     ImGuiID         SourceParentId;     // Source parent id (if available)
     int             DataFrameCount;     // Data timestamp
-    char            DataType[12 + 1];   // Data type tag (short user-supplied string, 12 characters max)
+    char            DataType[32+1];     // Data type tag (short user-supplied string, 32 characters max)
     bool            Preview;            // Set when AcceptDragDropPayload() was called and mouse has been hovering the target item (nb: handle overlapping drag targets)
     bool            Delivery;           // Set when AcceptDragDropPayload() was called and mouse button is released over the target item.
 
@@ -1680,7 +1680,7 @@ struct ImFontConfig
     float           RasterizerMultiply;         // 1.0f     // Brighten (>1.0f) or darken (<1.0f) font output. Brightening small fonts may be a good workaround to make them more readable.
 
     // [Internal]
-    char            Name[32];                               // Name (strictly to ease debugging)
+    char            Name[40];                               // Name (strictly to ease debugging)
     ImFont*         DstFont;
 
     IMGUI_API ImFontConfig();
@@ -1815,7 +1815,7 @@ struct ImFont
     // Members: Hot ~62/78 bytes
     float                       FontSize;           // <user set>   // Height of characters, set during loading (don't change after loading)
     float                       Scale;              // = 1.f        // Base font scale, multiplied by the per-window font scale which you can adjust with SetFontScale()
-    ImVec2                      DisplayOffset;      // = (0.f,1.f)  // Offset font rendering by xx pixels
+    ImVec2                      DisplayOffset;      // = (0.f,0.f)  // Offset font rendering by xx pixels
     ImVector<ImFontGlyph>       Glyphs;             //              // All glyphs.
     ImVector<float>             IndexAdvanceX;      //              // Sparse. Glyphs->AdvanceX in a directly indexable way (more cache-friendly, for CalcTextSize functions which are often bottleneck in large UI).
     ImVector<unsigned short>    IndexLookup;        //              // Sparse. Index glyphs by Unicode code-point.
@@ -1828,6 +1828,7 @@ struct ImFont
     ImFontConfig*               ConfigData;         //              // Pointer within ContainerAtlas->ConfigData
     ImFontAtlas*                ContainerAtlas;     //              // What we has been loaded into
     float                       Ascent, Descent;    //              // Ascent: distance from top to bottom of e.g. 'A' [0..FontSize]
+    bool                        DirtyLookupTables;
     int                         MetricsTotalSurface;//              // Total surface in pixels to get an idea of the font rasterization/texture cost (not exact, we approximate the cost of padding between glyphs)
 
     // Methods

imgui_draw.cpp

@@ -1525,6 +1525,7 @@ ImFont* ImFontAtlas::AddFontDefault(const ImFontConfig* font_cfg_template)
 
     const char* ttf_compressed_base85 = GetDefaultCompressedFontDataTTFBase85();
     ImFont* font = AddFontFromMemoryCompressedBase85TTF(ttf_compressed_base85, font_cfg.SizePixels, &font_cfg, GetGlyphRangesDefault());
+    font->DisplayOffset.y = 1.0f;
     return font;
 }
 
@@ -1543,7 +1544,7 @@ ImFont* ImFontAtlas::AddFontFromFileTTF(const char* filename, float size_pixels,
         // Store a short copy of filename into into the font name for convenience
         const char* p;
         for (p = filename + strlen(filename); p > filename && p[-1] != '/' && p[-1] != '\\'; p--) {}
-        snprintf(font_cfg.Name, IM_ARRAYSIZE(font_cfg.Name), "%s, %.0fpx", p, size_pixels);
+        ImFormatString(font_cfg.Name, IM_ARRAYSIZE(font_cfg.Name), "%s, %.0fpx", p, size_pixels);
     }
     return AddFontFromMemoryTTF(data, data_size, size_pixels, &font_cfg, glyph_ranges);
 }
@@ -1817,13 +1818,15 @@ bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
         ImFontConfig& cfg = atlas->ConfigData[input_i];
         ImFontTempBuildData& tmp = tmp_array[input_i];
         ImFont* dst_font = cfg.DstFont; // We can have multiple input fonts writing into a same destination font (when using MergeMode=true)
+        if (cfg.MergeMode)
+            dst_font->BuildLookupTable();
 
         const float font_scale = stbtt_ScaleForPixelHeight(&tmp.FontInfo, cfg.SizePixels);
         int unscaled_ascent, unscaled_descent, unscaled_line_gap;
         stbtt_GetFontVMetrics(&tmp.FontInfo, &unscaled_ascent, &unscaled_descent, &unscaled_line_gap);
 
-        const float ascent = unscaled_ascent * font_scale;
-        const float descent = unscaled_descent * font_scale;
+        const float ascent = ImFloor(unscaled_ascent * font_scale + ((unscaled_ascent > 0.0f) ? +1 : -1));
+        const float descent = ImFloor(unscaled_descent * font_scale + ((unscaled_descent > 0.0f) ? +1 : -1));
         ImFontAtlasBuildSetupFont(atlas, dst_font, &cfg, ascent, descent);
         const float off_x = cfg.GlyphOffset.x;
         const float off_y = cfg.GlyphOffset.y + (float)(int)(dst_font->Ascent + 0.5f);
@@ -1960,7 +1963,8 @@ void ImFontAtlasBuildFinish(ImFontAtlas* atlas)
 
     // Build all fonts lookup tables
     for (int i = 0; i < atlas->Fonts.Size; i++)
-        atlas->Fonts[i]->BuildLookupTable();
+        if (atlas->Fonts[i]->DirtyLookupTables)
+            atlas->Fonts[i]->BuildLookupTable();
 }
 
 // Retrieve list of range (2 int per range, values are inclusive)
@@ -2136,7 +2140,7 @@ ImFont::ImFont()
 {
     Scale = 1.0f;
     FallbackChar = (ImWchar)'?';
-    DisplayOffset = ImVec2(0.0f, 1.0f);
+    DisplayOffset = ImVec2(0.0f, 0.0f);
     ClearOutputData();
 }
 
@@ -2165,6 +2169,7 @@ void    ImFont::ClearOutputData()
     ConfigData = NULL;
     ContainerAtlas = NULL;
     Ascent = Descent = 0.0f;
+    DirtyLookupTables = true;
     MetricsTotalSurface = 0;
 }
 
@@ -2177,6 +2182,7 @@ void ImFont::BuildLookupTable()
     IM_ASSERT(Glyphs.Size < 0xFFFF); // -1 is reserved
     IndexAdvanceX.clear();
     IndexLookup.clear();
+    DirtyLookupTables = false;
     GrowIndex(max_codepoint + 1);
     for (int i = 0; i < Glyphs.Size; i++)
     {
@@ -2241,6 +2247,7 @@ void ImFont::AddGlyph(ImWchar codepoint, float x0, float y0, float x1, float y1,
         glyph.AdvanceX = (float)(int)(glyph.AdvanceX + 0.5f);
     
     // Compute rough surface usage metrics (+1 to account for average padding, +0.99 to round)
+    DirtyLookupTables = true;
     MetricsTotalSurface += (int)((glyph.U1 - glyph.U0) * ContainerAtlas->TexWidth + 1.99f) * (int)((glyph.V1 - glyph.V0) * ContainerAtlas->TexHeight + 1.99f);
 }
 

imgui_internal.h

@@ -714,7 +714,7 @@ struct ImGuiContext
     ImGuiID                 DragDropAcceptIdPrev;               // Target item id from previous frame (we need to store this to allow for overlapping drag and drop targets)
     int                     DragDropAcceptFrameCount;           // Last time a target expressed a desire to accept the source
     ImVector<unsigned char> DragDropPayloadBufHeap;             // We don't expose the ImVector<> directly
-    unsigned char           DragDropPayloadBufLocal[8];
+    unsigned char           DragDropPayloadBufLocal[8];         // Local buffer for small payloads
 
     // Widget state
     ImGuiTextEditState      InputTextState;

misc/freetype/imgui_freetype.cpp

@@ -315,6 +315,8 @@ bool ImGuiFreeType::BuildFontAtlas(ImFontAtlas* atlas, unsigned int extra_flags)
         ImFontConfig& cfg = atlas->ConfigData[input_i];
         FreeTypeFont& font_face = fonts[input_i];
         ImFont* dst_font = cfg.DstFont;
+        if (cfg.MergeMode)
+            dst_font->BuildLookupTable();
 
         const float ascent = font_face.Info.Ascender;
         const float descent = font_face.Info.Descender;