(Breaking) Fonts: removed ImFontConfig::GlyphExtraSpacing option which seems largely obsolete and unused. (#242)

docs/CHANGELOG.txt

@@ -41,6 +41,9 @@ HOW TO UPDATE?
 
 Breaking changes:
 
+- Removed ImFontConfig::GlyphExtraSpacing option which seems largely obsolete and
+  unused. If you were using this please report it! (#242).
+
 Other changes:
 
 - Fixed IsItemDeactivatedAfterEdit() signal being broken for Checkbox(),

docs/FONTS.md

@@ -110,7 +110,7 @@ ImGui::PopFont();
 **For advanced options create a ImFontConfig structure and pass it to the AddFont() function (it will be copied internally):**
 ```cpp
 ImFontConfig config;
-config.GlyphExtraSpacing.x = 1.0f;
+config.RasterizerDensity = 2.0f;
 ImFont* font = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, &config);
 ```
 

imgui.cpp

@@ -430,6 +430,7 @@ CODE
  When you are not sure about an old symbol or function name, try using the Search/Find function of your IDE to look for comments or references in all imgui files.
  You can read releases logs https://github.com/ocornut/imgui/releases for more details.
 
+ - 2025/02/03 (1.91.9) - removed ImFontConfig::GlyphExtraSpacing option which seems largely obsolete and unused. If you were using this please report it!
  - 2025/01/22 (1.91.8) - removed ImGuiColorEditFlags_AlphaPreview (made value 0): it is now the default behavior.
                          prior to 1.91.8: alpha was made opaque in the preview by default _unless_ using ImGuiColorEditFlags_AlphaPreview. We now display the preview as transparent by default. You can use ImGuiColorEditFlags_AlphaOpaque to use old behavior.
                          the new flags (ImGuiColorEditFlags_AlphaOpaque, ImGuiColorEditFlags_AlphaNoBg + existing ImGuiColorEditFlags_AlphaPreviewHalf) may be combined better and allow finer controls:

imgui.h

@@ -29,7 +29,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
 #define IMGUI_VERSION       "1.91.9 WIP"
-#define IMGUI_VERSION_NUM   19181
+#define IMGUI_VERSION_NUM   19182
 #define IMGUI_HAS_TABLE
 
 /*
@@ -3257,7 +3257,7 @@ struct ImFontConfig
     int             OversampleH;            // 0 (2)    // Rasterize at higher quality for sub-pixel positioning. 0 == auto == 1 or 2 depending on size. Note the difference between 2 and 3 is minimal. You can reduce this to 1 for large glyphs save memory. Read https://github.com/nothings/stb/blob/master/tests/oversample/README.md for details.
     int             OversampleV;            // 0 (1)    // Rasterize at higher quality for sub-pixel positioning. 0 == auto == 1. This is not really useful as we don't use sub-pixel positions on the Y axis.
     float           SizePixels;             //          // Size in pixels for rasterizer (more or less maps to the resulting font height).
-    ImVec2          GlyphExtraSpacing;      // 0, 0     // Extra spacing (in pixels) between glyphs when rendered: essentially add to glyph->AdvanceX. Only X axis is supported for now.
+    //ImVec2        GlyphExtraSpacing;      // 0, 0     // (REMOVED AT IT SEEMS LARGELY OBSOLETE. PLEASE REPORT IF YOU WERE USING THIS). Extra spacing (in pixels) between glyphs when rendered: essentially add to glyph->AdvanceX. Only X axis is supported for now.
     ImVec2          GlyphOffset;            // 0, 0     // Offset all glyphs from this font input.
     const ImWchar*  GlyphRanges;            // NULL     // THE ARRAY DATA NEEDS TO PERSIST AS LONG AS THE FONT IS ALIVE. Pointer to a user-provided list of Unicode range (2 value per range, values are inclusive, zero-terminated list).
     float           GlyphMinAdvanceX;       // 0        // Minimum AdvanceX for glyphs, set Min to align font icons, set both Min/Max to enforce mono-space font
@@ -3281,7 +3281,7 @@ struct ImFontGlyph
     unsigned int    Colored : 1;        // Flag to indicate glyph is colored and should generally ignore tinting (make it usable with no shift on little-endian as this is used in loops)
     unsigned int    Visible : 1;        // Flag to indicate glyph has no visible pixels (e.g. space). Allow early out when rendering.
     unsigned int    Codepoint : 30;     // 0x0000..0x10FFFF
-    float           AdvanceX;           // Distance to next character (= data from font + ImFontConfig::GlyphExtraSpacing.x baked in)
+    float           AdvanceX;           // Horizontal distance to advance layout with
     float           X0, Y0, X1, Y1;     // Glyph corners
     float           U0, V0, U1, V1;     // Texture coordinates
 };

imgui_draw.cpp

@@ -3349,7 +3349,7 @@ void ImFontAtlasBuildFinish(ImFontAtlas* atlas)
         if (r->Font == NULL || r->GlyphID == 0)
             continue;
 
-        // Will ignore ImFontConfig settings: GlyphMinAdvanceX, GlyphMinAdvanceY, GlyphExtraSpacing, PixelSnapH
+        // Will ignore ImFontConfig settings: GlyphMinAdvanceX, GlyphMinAdvanceY, PixelSnapH
         IM_ASSERT(r->Font->ContainerAtlas == atlas);
         ImVec2 uv0, uv1;
         atlas->CalcCustomRectUV(r, &uv0, &uv1);
@@ -3858,9 +3858,6 @@ void ImFont::AddGlyph(const ImFontConfig* cfg, ImWchar codepoint, float x0, floa
         // Snap to pixel
         if (cfg->PixelSnapH)
             advance_x = IM_ROUND(advance_x);
-
-        // Bake spacing
-        advance_x += cfg->GlyphExtraSpacing.x;
     }
 
     int glyph_idx = Glyphs.Size;