TabBar: Fixed single tab shrinking reducing the tab to 0.0f size. Broken by a856c670c1.

imgui_widgets.cpp

@@ -1366,7 +1366,7 @@ void ImGui::ShrinkWidths(ImGuiShrinkWidthItem* items, int count, float width_exc
 {
     if (count == 1)
     {
-        items[0].Width -= width_excess;
+        items[0].Width = ImMax(items[0].Width - width_excess, 1.0f);
         return;
     }
     ImQsort(items, (size_t)count, sizeof(ImGuiShrinkWidthItem), ShrinkWidthItemComparer);
@@ -6562,6 +6562,7 @@ static void ImGui::TabBarLayout(ImGuiTabBar* tab_bar)
         {
             ImGuiTabItem* tab = &tab_bar->Tabs[tab_n];
             tab->Width = ImMin(tab->WidthContents, tab_max_width);
+            IM_ASSERT(tab->Width > 0.0f);
         }
     }