Metrics windows display storage size

imgui.cpp

@@ -11477,6 +11477,7 @@ void ImGui::ShowMetricsWindow(bool* opened)
                 NodeDrawList(window->DrawList, "DrawList");
                 if (window->RootWindow != window) NodeWindow(window->RootWindow, "RootWindow");
                 if (window->DC.ChildWindows.size() > 0) NodeWindows(window->DC.ChildWindows, "ChildWindows");
+                ImGui::BulletText("Storage: %d bytes", (int)window->StateStorage.Data.size() * sizeof(ImGuiStorage::Pair));
                 ImGui::TreePop();
             }
         };