fix: add try/finally block in withoutSaving method to ensure state restoration (#5837)

Co-authored-by: ederjiang <eder@57blocks.com>

packages/slate-history/src/history-editor.ts

@@ -120,7 +120,10 @@ export const HistoryEditor = {
   withoutSaving(editor: HistoryEditor, fn: () => void): void {
     const prev = HistoryEditor.isSaving(editor)
     SAVING.set(editor, false)
-    fn()
-    SAVING.set(editor, prev)
+    try {
+      fn()
+    } finally {
+      SAVING.set(editor, prev)
+    }
   },
 }