Refactor editor windowing and update renderer regression

editor/app/Windowing/System/EditorWindowSystem.cpp

@@ -54,6 +54,30 @@ UIEditorWindowWorkspaceController EditorWindowSystem::BuildWorkspaceMutationCont
     return UIEditorWindowWorkspaceController(GetPanelRegistry(), GetWindowSet());
 }
 
+bool EditorWindowSystem::CommitLiveWindowMutation(
+    std::string_view windowId,
+    const UIEditorWorkspaceController& workspaceController,
+    std::string& outError) {
+    if (windowId.empty()) {
+        outError = "live window mutation missing window id";
+        return false;
+    }
+
+    UIEditorWindowWorkspaceSet nextWindowSet = GetWindowSet();
+    UIEditorWindowWorkspaceState* existingState =
+        FindMutableUIEditorWindowWorkspaceState(nextWindowSet, windowId);
+    if (existingState == nullptr) {
+        outError =
+            "live window mutation references unknown window '" +
+            std::string(windowId) + "'";
+        return false;
+    }
+
+    existingState->workspace = workspaceController.GetWorkspace();
+    existingState->session = workspaceController.GetSession();
+    return m_workspaceStore.TrySetWindowSet(std::move(nextWindowSet), outError);
+}
+
 EditorWindowSynchronizationPlan EditorWindowSystem::BuildPlanForWindowSet(
     const UIEditorWindowWorkspaceSet& targetWindowSet,
     const std::vector<EditorWindowHostSnapshot>& hostWindows,