ImGuiFullscreen: Fix choice popup selected drawing over border

src/util/imgui_fullscreen.cpp

@@ -1123,9 +1123,12 @@ bool ImGuiFullscreen::ActiveButton(const char* title, bool is_active, bool enabl
 {
   if (is_active)
   {
+    // don't draw over a prerendered border
+    const float border_size = ImGui::GetStyle().FrameBorderSize;
+    const ImVec2 border_size_v = ImVec2(border_size, border_size);
     ImVec2 pos, size;
     GetMenuButtonFrameBounds(height, &pos, &size);
-    ImGui::RenderFrame(pos, pos + size, ImGui::GetColorU32(UIPrimaryColor), false);
+    ImGui::RenderFrame(pos + border_size_v, pos + size - border_size_v, ImGui::GetColorU32(UIPrimaryColor), false);
   }
 
   ImRect bb;