Refactor new editor state ownership model

new_editor/app/Platform/Win32/WindowManager/WindowSync.cpp

@@ -182,14 +182,26 @@ bool EditorWindowWorkspaceCoordinator::SynchronizeWindowsFromWindowSet(
     return true;
 }
 
-bool EditorWindowWorkspaceCoordinator::SynchronizeWindowsFromController(
+bool EditorWindowWorkspaceCoordinator::CommitWindowWorkspaceMutation(
     const UIEditorWindowWorkspaceController& windowWorkspaceController,
     std::string_view preferredNewWindowId,
     const POINT& preferredScreenPoint) {
-    return SynchronizeWindowsFromWindowSet(
-        windowWorkspaceController.GetWindowSet(),
-        preferredNewWindowId,
-        preferredScreenPoint);
+    const UIEditorWindowWorkspaceSet nextWindowSet = windowWorkspaceController.GetWindowSet();
+    std::string error = {};
+    if (!m_workspaceStore.ValidateWindowSet(nextWindowSet, error)) {
+        LogRuntimeTrace("window", "workspace mutation validation failed: " + error);
+        return false;
+    }
+
+    if (!SynchronizeWindowsFromWindowSet(
+            nextWindowSet,
+            preferredNewWindowId,
+            preferredScreenPoint)) {
+        return false;
+    }
+
+    m_workspaceStore.ReplaceWindowSet(nextWindowSet);
+    return true;
 }
 
 } // namespace XCEngine::UI::Editor::App::Internal