Fonts: fixed RenderText() asserting when crossing VtxOffset change boundaries. (#8720, #8465)

imgui_draw.cpp

@@ -5581,7 +5581,6 @@ begin:
         return;
 
     // Reserve vertices for remaining worse case (over-reserving is useful and easily amortized)
-    const int cmd_count = draw_list->CmdBuffer.Size;
     const int vtx_count_max = (int)(text_end - s) * 4;
     const int idx_count_max = (int)(text_end - s) * 6;
     const int idx_expected_size = draw_list->IdxBuffer.Size + idx_count_max;
@@ -5589,6 +5588,7 @@ begin:
     ImDrawVert*  vtx_write = draw_list->_VtxWritePtr;
     ImDrawIdx*   idx_write = draw_list->_IdxWritePtr;
     unsigned int vtx_index = draw_list->_VtxCurrentIdx;
+    const int cmd_count = draw_list->CmdBuffer.Size;
 
     const ImU32 col_untinted = col | ~IM_COL32_A_MASK;
     const char* word_wrap_eol = NULL;
@@ -5711,6 +5711,8 @@ begin:
         draw_list->CmdBuffer.pop_back();
         draw_list->PrimUnreserve(idx_count_max, vtx_count_max);
         draw_list->AddDrawCmd();
+        //IMGUI_DEBUG_LOG("RenderText: cancel and retry to missing glyphs.\n"); // [DEBUG]
+        //draw_list->AddRectFilled(pos, pos + ImVec2(10, 10), IM_COL32(255, 0, 0, 255)); // [DEBUG]
         goto begin;
         //RenderText(draw_list, size, pos, col, clip_rect, text_begin, text_end, wrap_width, cpu_fine_clip); // FIXME-OPT: Would a 'goto begin' be better for code-gen?
         //return;