Update popup menu

Add file editor

Fix android service issues

Optimize desktop background performance

Optimize android main process performance

Optimize delay test

Optimize vpn protect

lib/common/render.dart

@@ -0,0 +1,56 @@
+import 'package:fl_clash/common/common.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/scheduler.dart';
+
+class Render {
+  static Render? _instance;
+  bool _isPaused = false;
+  final _dispatcher = SchedulerBinding.instance.platformDispatcher;
+  FrameCallback? _beginFrame;
+  VoidCallback? _drawFrame;
+
+  Render._internal();
+
+  factory Render() {
+    _instance ??= Render._internal();
+    return _instance!;
+  }
+
+  active() {
+    resume();
+    pause();
+  }
+
+  pause() {
+    debouncer.call(
+      "render_pause",
+      _pause,
+      duration: Duration(seconds: 5),
+    );
+  }
+
+  resume() {
+    debouncer.cancel("render_pause");
+    _resume();
+  }
+
+  void _pause() {
+    if (_isPaused) return;
+    _isPaused = true;
+    _beginFrame = _dispatcher.onBeginFrame;
+    _drawFrame = _dispatcher.onDrawFrame;
+    _dispatcher.onBeginFrame = null;
+    _dispatcher.onDrawFrame = null;
+    debugPrint("[App] pause");
+  }
+
+  void _resume() {
+    if (!_isPaused) return;
+    _isPaused = false;
+    _dispatcher.onBeginFrame = _beginFrame;
+    _dispatcher.onDrawFrame = _drawFrame;
+    debugPrint("[App] resume");
+  }
+}
+
+final render = system.isDesktop ? Render() : null;