Refine editor window architecture

editor/app/UtilityWindows/EditorUtilityWindowRegistry.h

@@ -2,6 +2,7 @@
 
 #include "UtilityWindows/EditorUtilityWindowKind.h"
 #include "UtilityWindows/EditorUtilityWindowPanel.h"
+#include "Platform/Win32/Windowing/EditorWindowState.h"
 
 #include <XCEngine/UI/Types.h>
 
@@ -10,10 +11,18 @@
 
 namespace XCEngine::UI::Editor::App {
 
+enum class EditorUtilityWindowReusePolicy {
+    SingleInstance = 0,
+};
+
 struct EditorUtilityWindowDescriptor {
     EditorUtilityWindowKind kind = EditorUtilityWindowKind::None;
     std::string_view windowId = {};
     const wchar_t* title = L"";
+    EditorUtilityWindowReusePolicy reusePolicy =
+        EditorUtilityWindowReusePolicy::SingleInstance;
+    EditorWindowChromePolicy chromePolicy = {};
+    EditorWindowNativeStylePolicy nativeStylePolicy = {};
     ::XCEngine::UI::UISize preferredOuterSize = {};
     ::XCEngine::UI::UISize minimumOuterSize = {};
 };