Tabs: use AddRectFilled().

imgui_widgets.cpp

diff --git a/imgui_widgets.cpp b/imgui_widgets.cpp
index a98cb69..6a66052 100644
--- a/imgui_widgets.cpp
+++ b/imgui_widgets.cpp
@@ -10873,13 +10873,9 @@
     IM_UNUSED(flags);
     IM_ASSERT(width > 0.0f);
     const float rounding = ImMax(0.0f, ImMin((flags & ImGuiTabItemFlags_Button) ? g.Style.FrameRounding : g.Style.TabRounding, width * 0.5f - 1.0f));
-    const float y1 = bb.Min.y + 1.0f;
+    const float y1 = bb.Min.y + 1.0f; // Leave a bit of room in title bars.
     const float y2 = bb.Max.y - g.Style.TabBarBorderSize;
-    draw_list->PathLineTo(ImVec2(bb.Min.x, y2));
-    draw_list->PathArcToFast(ImVec2(bb.Min.x + rounding, y1 + rounding), rounding, 6, 9);
-    draw_list->PathArcToFast(ImVec2(bb.Max.x - rounding, y1 + rounding), rounding, 9, 12);
-    draw_list->PathLineTo(ImVec2(bb.Max.x, y2));
-    draw_list->PathFillConvex(col);
+    draw_list->AddRectFilled(bb.Min, ImVec2(bb.Max.x, y2), col, rounding, ImDrawFlags_RoundCornersTop);
     if (g.Style.TabBorderSize > 0.0f)
     {
         draw_list->PathLineTo(ImVec2(bb.Min.x + 0.5f, y2));