fix: prevent resetting dialog state on error (#524)

Former-commit-id: 8c7d91ea52

frontend/composables/use-defer.ts

@@ -0,0 +1,19 @@
+type DeferFunction<TArgs extends any[], TReturn> = (...args: TArgs) => TReturn;
+
+// useDefer is a function that takes a function and returns a function that
+// calls the original function and then calls the onComplete function.
+export function useDefer<TArgs extends any[], TReturn>(
+  onComplete: (...args: TArgs) => void,
+  func: DeferFunction<TArgs, TReturn>
+): DeferFunction<TArgs, TReturn> {
+  return (...args: TArgs) => {
+    let result: TReturn;
+    try {
+      result = func(...args);
+    } finally {
+      onComplete(...args);
+    }
+
+    return result;
+  };
+}