first commit

lib/components/extensions/state.dart

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+// Dart imports:
+import 'dart:async';
+
+// Flutter imports:
+import 'package:flutter/material.dart';
+
+extension StateExtension on State {
+  /// [setState] when it's not building, then wait until next frame built.
+  FutureOr<void> safeSetState(FutureOr<dynamic> Function() fn) async {
+    await fn();
+    if (mounted &&
+        !context.debugDoingBuild &&
+        context.owner?.debugBuilding == false) {
+      // ignore: invalid_use_of_protected_member, no-empty-block
+      setState(() {});
+    }
+
+    final Completer<void> completer = Completer<void>();
+
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      completer.complete();
+    });
+
+    return completer.future;
+  }
+}