Checkpoint current new editor host iteration

new_editor/app/Application.h

@@ -37,8 +37,15 @@ private:
     bool Initialize(HINSTANCE hInstance, int nCmdShow);
     void Shutdown();
     void RenderFrame();
-    void OnResize(UINT width, UINT height);
+    void OnResize();
+    void OnEnterSizeMove();
+    void OnExitSizeMove();
     void OnDpiChanged(UINT dpi, const RECT& suggestedRect);
+    void QueueWindowResize(UINT width, UINT height);
+    void QueueCurrentClientResize();
+    bool ApplyPendingWindowResize();
+    void RequestDeferredRenderFrame();
+    bool QueryCurrentClientPixelSize(UINT& outWidth, UINT& outHeight) const;
     bool IsPointerInsideClientArea() const;
     bool ApplyCurrentCursor() const;
     LPCWSTR ResolveCurrentCursorResource() const;
@@ -64,6 +71,7 @@ private:
     void QueueWindowFocusEvent(::XCEngine::UI::UIInputEventType type);
     static std::filesystem::path ResolveRepoRootPath();
     static LONG WINAPI HandleUnhandledException(EXCEPTION_POINTERS* exceptionInfo);
+    static bool IsVerboseRuntimeTraceEnabled();
 
     HWND m_hwnd = nullptr;
     HINSTANCE m_hInstance = nullptr;
@@ -78,6 +86,11 @@ private:
     bool m_trackingMouseLeave = false;
     UINT m_windowDpi = 96u;
     float m_dpiScale = 1.0f;
+    bool m_inInteractiveResize = false;
+    bool m_renderFrameQueued = false;
+    bool m_hasPendingWindowResize = false;
+    UINT m_pendingWindowResizeWidth = 0u;
+    UINT m_pendingWindowResizeHeight = 0u;
 };
 
 int RunXCUIEditorApp(HINSTANCE hInstance, int nCmdShow);