Fonts: reworked text ellipsis logic to ensure a "..." is always displayed instead of a single character. (#7024)

Requires 97d85338e8 and e4a865177e

docs/CHANGELOG.txt

@@ -84,6 +84,8 @@ Other changes:
   EndPopup() call. (#1651, #8499)
 - Error Handling: added better error report and recovery when calling EndFrame()
   or Render() without NewFrame(). Was previously only an assert.
+- Fonts: reworked text ellipsis logic to ensure a "..." is always displayed instead
+  of a single character. (#7024)
 - Fonts: word-wrapping code handle ideographic comma & full stop (U+3001, U+3002). (#8540)
 - Fonts: fixed CalcWordWrapPositionA() fallback when width is too small to wrap:
   would use a +1 offset instead of advancing to the next UTF-8 codepoint. (#8540)

imgui.cpp

@@ -3720,12 +3720,6 @@ void ImGui::RenderTextEllipsis(ImDrawList* draw_list, const ImVec2& pos_min, con
         // We can now claim the space between pos_max.x and ellipsis_max.x
         const float text_avail_width = ImMax((ImMax(pos_max.x, ellipsis_max_x) - ellipsis_width) - pos_min.x, 1.0f);
         float text_size_clipped_x = font->CalcTextSizeA(font_size, text_avail_width, 0.0f, text, text_end_full, &text_end_ellipsis).x;
-        if (text == text_end_ellipsis && text_end_ellipsis < text_end_full)
-        {
-            // Always display at least 1 character if there's no room for character + ellipsis
-            text_end_ellipsis = text + ImTextCountUtf8BytesFromChar(text, text_end_full);
-            text_size_clipped_x = font->CalcTextSizeA(font_size, FLT_MAX, 0.0f, text, text_end_ellipsis).x;
-        }
         while (text_end_ellipsis > text && ImCharIsBlankA(text_end_ellipsis[-1]))
         {
             // Trim trailing space before ellipsis (FIXME: Supporting non-ascii blanks would be nice, for this we need a function to backtrack in UTF-8 text)