fix: Flush pending DOM updates before .focus() (excalidraw#8901)

packages/excalidraw/components/ConfirmDialog.tsx

@@ -1,3 +1,4 @@
+import { flushSync } from "react-dom";
 import { t } from "../i18n";
 import type { DialogProps } from "./Dialog";
 import { Dialog } from "./Dialog";
@@ -43,7 +44,14 @@ const ConfirmDialog = (props: Props) => {
           onClick={() => {
             setAppState({ openMenu: null });
             setIsLibraryMenuOpen(false);
-            onCancel();
+            // flush any pending updates synchronously,
+            // otherwise it could lead to crash in some chromium versions (131.0.6778.86),
+            // when `.focus` is invoked with container in some intermediate state
+            // (container seems mounted in DOM, but focus still causes a crash)
+            flushSync(() => {
+              onCancel();
+            });
+
             container?.focus();
           }}
         />
@@ -52,7 +60,14 @@ const ConfirmDialog = (props: Props) => {
           onClick={() => {
             setAppState({ openMenu: null });
             setIsLibraryMenuOpen(false);
-            onConfirm();
+            // flush any pending updates synchronously,
+            // otherwise it leads to crash in some chromium versions (131.0.6778.86),
+            // when `.focus` is invoked with container in some intermediate state
+            // (container seems mounted in DOM, but focus still causes a crash)
+            flushSync(() => {
+              onConfirm();
+            });
+
             container?.focus();
           }}
           actionType="danger"