not accept dialog show when desktop page dispose

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/common.dart

@@ -600,12 +600,16 @@ class OverlayDialogManager {
   int _tagCount = 0;
 
   OverlayEntry? _mobileActionsOverlayEntry;
+  bool _stop = false;
 
   void setOverlayState(OverlayKeyState overlayKeyState) {
     _overlayKeyState = overlayKeyState;
   }
 
-  void dismissAll() {
+  void dismissAll({bool? stop}) {
+    if (stop != null) {
+      _stop = stop;
+    }
     _dialogs.forEach((key, value) {
       value.complete(null);
       BackButtonInterceptor.removeByName(key);
@@ -625,6 +629,7 @@ class OverlayDialogManager {
       String? tag,
       bool useAnimation = true,
       bool forceGlobal = false}) {
+    if (_stop) return Future(() => null);
     final overlayState =
         forceGlobal ? globalKey.currentState?.overlay : _overlayKeyState.state;