Fonts: comment about swapping EllipsisChar value. (#9228)

imgui.h

diff --git a/imgui.h b/imgui.h
index 6f488e6..81b2f8b 100644
--- a/imgui.h
+++ b/imgui.h
@@ -3858,10 +3858,10 @@
     ImGuiID                     FontId;             // Unique identifier for the font
     float                       LegacySize;         // 4     // in  // Font size passed to AddFont(). Use for old code calling PushFont() expecting to use that size. (use ImGui::GetFontBaked() to get font baked at current bound size).
     ImVector<ImFontConfig*>     Sources;            // 16    // in  // List of sources. Pointers within OwnerAtlas->Sources[]
-    ImWchar                     EllipsisChar;       // 2-4   // out // Character used for ellipsis rendering ('...').
+    ImWchar                     EllipsisChar;       // 2-4   // out // Character used for ellipsis rendering ('...'). If you ever want to temporarily swap this for an alternative/dummy char, make sure to clear EllipsisAutoBake.
     ImWchar                     FallbackChar;       // 2-4   // out // Character used if a glyph isn't found (U+FFFD, '?')
-    ImU8                        Used8kPagesMap[(IM_UNICODE_CODEPOINT_MAX+1)/8192/8]; // 1 bytes if ImWchar=ImWchar16, 16 bytes if ImWchar==ImWchar32. Store 1-bit for each block of 4K codepoints that has one active glyph. This is mainly used to facilitate iterations across all used codepoints.
-    bool                        EllipsisAutoBake;   // 1     //     // Mark when the "..." glyph needs to be generated.
+    ImU8                        Used8kPagesMap[(IM_UNICODE_CODEPOINT_MAX+1)/8192/8]; // 1 bytes if ImWchar=ImWchar16, 17 bytes if ImWchar==ImWchar32. Store 1-bit for each block of 8K codepoints that has one active glyph. This is mainly used to facilitate iterations across all used codepoints.
+    bool                        EllipsisAutoBake;   // 1     //     // Mark when the "..." glyph (== EllipsisChar) needs to be generated by combining multiple '.'.
     ImGuiStorage                RemapPairs;         // 16    //     // Remapping pairs when using AddRemapChar(), otherwise empty.
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     float                       Scale;              // 4     // in  // Legacy base font scale (~1.0f), multiplied by the per-window font scale which you can adjust with SetWindowFontScale()