ImFont: Minor adjustment to the structure.

Examples: Removed unused variable.

examples/example_apple_opengl2/main.mm

@@ -91,7 +91,6 @@
 	ImGui::Render();
 	[[self openGLContext] makeCurrentContext];
 
-    ImGuiIO& io = ImGui::GetIO();
     ImDrawData* draw_data = ImGui::GetDrawData();
     GLsizei width  = (GLsizei)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
     GLsizei height = (GLsizei)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);

imgui.h

@@ -2081,26 +2081,26 @@ struct ImFontAtlas
 // ImFontAtlas automatically loads a default embedded font for you when you call GetTexDataAsAlpha8() or GetTexDataAsRGBA32().
 struct ImFont
 {
-    // Members: Hot ~24/32 bytes (for CalcTextSize)
-    ImVector<float>             IndexAdvanceX;      // 12/16 // out //            // Sparse. Glyphs->AdvanceX in a directly indexable way (cache-friendly for CalcTextSize functions which only this this info, and are often bottleneck in large UI).
-    float                       FontSize;           // 4     // in  // <user set> // Height of characters, set during loading (don't change after loading)
+    // Members: Hot ~20/24 bytes (for CalcTextSize)
+    ImVector<float>             IndexAdvanceX;      // 12-16 // out //            // Sparse. Glyphs->AdvanceX in a directly indexable way (cache-friendly for CalcTextSize functions which only this this info, and are often bottleneck in large UI).
     float                       FallbackAdvanceX;   // 4     // out // = FallbackGlyph->AdvanceX
-    ImWchar                     FallbackChar;       // 2     // in  // = '?'      // Replacement glyph if one isn't found. Only set via SetFallbackChar()
+    float                       FontSize;           // 4     // in  //            // Height of characters/line, set during loading (don't change after loading)
 
     // Members: Hot ~36/48 bytes (for CalcTextSize + render loop)
     ImVector<ImWchar>           IndexLookup;        // 12-16 // out //            // Sparse. Index glyphs by Unicode code-point.
     ImVector<ImFontGlyph>       Glyphs;             // 12-16 // out //            // All glyphs.
-    ImVec2                      DisplayOffset;      // 8     // in  // = (0,0)    // Offset font rendering by xx pixels
     const ImFontGlyph*          FallbackGlyph;      // 4-8   // out // = FindGlyph(FontFallbackChar)
+    ImVec2                      DisplayOffset;      // 8     // in  // = (0,0)    // Offset font rendering by xx pixels
 
-    // Members: Cold ~28/40 bytes
+    // Members: Cold ~32/40 bytes
     ImFontAtlas*                ContainerAtlas;     // 4-8   // out //            // What we has been loaded into
     const ImFontConfig*         ConfigData;         // 4-8   // in  //            // Pointer within ContainerAtlas->ConfigData
     short                       ConfigDataCount;    // 2     // in  // ~ 1        // Number of ImFontConfig involved in creating this font. Bigger than 1 when merging multiple font sources into one ImFont.
-    bool                        DirtyLookupTables;  // 1     // out //
+    ImWchar                     FallbackChar;       // 2     // in  // = '?'      // Replacement glyph if one isn't found. Only set via SetFallbackChar()
     float                       Scale;              // 4     // in  // = 1.f      // Base font scale, multiplied by the per-window font scale which you can adjust with SetWindowFontScale()
-    float                       Ascent, Descent;    // 8     // out //            // Ascent: distance from top to bottom of e.g. 'A' [0..FontSize]
+    float                       Ascent, Descent;    // 4+4   // out //            // Ascent: distance from top to bottom of e.g. 'A' [0..FontSize]
     int                         MetricsTotalSurface;// 4     // out //            // Total surface in pixels to get an idea of the font rasterization/texture cost (not exact, we approximate the cost of padding between glyphs)
+    bool                        DirtyLookupTables;  // 1     // out //
 
     // Methods
     IMGUI_API ImFont();