Tabs: attempt to fix infinite loop in tab-bar ShrinkWidth() by using an epsilon. (#5652, #3421, #8800)

imgui_widgets.cpp

@@ -1840,7 +1840,7 @@ void ImGui::ShrinkWidths(ImGuiShrinkWidthItem* items, int count, float width_exc
     }
     ImQsort(items, (size_t)count, sizeof(ImGuiShrinkWidthItem), ShrinkWidthItemComparer); // Sort largest first, smallest last.
     int count_same_width = 1;
-    while (width_excess > 0.0f && count_same_width < count)
+    while (width_excess > 0.001f && count_same_width < count)
     {
         while (count_same_width < count && items[0].Width <= items[count_same_width].Width)
             count_same_width++;