Fixed warning for flutter 3.0.0

_ambiguate is a fix for warning below version 3.0.0. If you do not need, please remove it.

https://docs.flutter.dev/development/tools/sdk/release-notes/release-notes-3.0.0#your-code

https://www.reddit.com/r/FlutterDev/comments/nuucwl/in_app_notification_show_any_widget_as_a/h12t5h2?utm_source=share&utm_medium=web2x&context=3

Reference for implementation: https://medium.com/saugo360/https-medium-com-saugo360-flutter-using-overlay-to-display-floating-widgets-2e6d0e8decb9

https://github.com/cb-cloud/flutter_in_app_notification/projects/1#card-76390399

To showing notification, InAppNotification class used findAncestorStateOfType(). But this method is expensive when using BuildContext that obtained from deep hierarchy of widget tree(see document), so I replaced it with getElementForInheritedWidgetOfExactType() in InheritedWidget.

FIX

• Fixed a bug that curve option in InAppNotification.show() didn't affect.

FEAT

• Added dismissCurve option in InAppNotification.show().

CHORE

• Refactored a whole of code.
  • More readable logic around showing and dismissing notification.
  • Isolated AnimationController for interactions from one for showing.
• Expanded example app to change sample notification size.

Discussed in https://github.com/cb-cloud/flutter_in_app_notification/discussions/13

I have an in-app socket notification stream system that listens messages in home. (main->app->home) When I try to navigate a page and make http call, it throws the error below.

Edit: When I trigger it in initState() it works perfectly.

══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
'package:flutter/src/rendering/viewport.dart': Failed assertion: line 1702 pos 12: 'center!.parent
== this': is not true.

Either the assertion indicates an error in the framework itself, or we should provide substantially
more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md

When the exception was thrown, this was the stack:
#2      RenderViewport.indexOfFirstChild (package:flutter/src/rendering/viewport.dart:1702:12)
#3      RenderViewportBase.debugDescribeChildren (package:flutter/src/rendering/viewport.dart:974:17)
#4      DiagnosticableTreeNode.getChildren (package:flutter/src/foundation/diagnostics.dart:2989:48)
#5      DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1562:32)
#6      DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1603:6)
#7      DiagnosticsNode.toJsonList.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1627:19)
#8      MappedListIterable.elementAt (dart:_internal/iterable.dart:413:31)
#9      ListIterator.moveNext (dart:_internal/iterable.dart:342:26)
#10     new _GrowableList._ofEfficientLengthIterable (dart:core-patch/growable_array.dart:188:27)
#11     new _GrowableList.of (dart:core-patch/growable_array.dart:150:28)
#12     new List.of (dart:core-patch/array_patch.dart:51:28)
#13     ListIterable.toList (dart:_internal/iterable.dart:213:44)
#14     DiagnosticsNode.toJsonList (package:flutter/src/foundation/diagnostics.dart:1628:8)
#15     DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1590:25)
#16     DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1603:6)
#17     WidgetInspectorService._nodeToJson (package:flutter/src/widgets/widget_inspector.dart:1513:18)
#18     WidgetInspectorService._reportStructuredError (package:flutter/src/widgets/widget_inspector.dart:922:44)
#19     FlutterError.reportError (package:flutter/src/foundation/assertions.dart:1137:14)
#20     RenderObject._debugReportException (package:flutter/src/rendering/object.dart:1370:18)
#21     RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1713:7)
#22     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:882:18)
#23     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:483:19)
#24     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:883:13)
#25     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:349:5)
#26     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1145:15)
#27     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9)
#28     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:996:5)
#32     _invoke (dart:ui/hooks.dart:150:10)
#33     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:270:5)
#34     _drawFrame (dart:ui/hooks.dart:114:31)
(elided 5 frames from class _AssertionError and dart:async)
════════════════════════════════════════════════════════════════════════════════════════════════════

Another exception was thrown: Updated layout information required for RenderViewport#637e1 NEEDS-LAYOUT to calculate semantics.
flutter: EVENT FROM NOTIFICATION: Instance of 'SocketNotification'
flutter: EVENT FROM NOTIFICATION: Instance of 'SocketNotification'
flutter: EVENT FROM NOTIFICATION: Instance of 'SocketNotification'

Another exception was thrown: RenderBox.size accessed beyond the scope of resize, layout, or permitted parent access. RenderBox can always access
its own size, otherwise, the only object that is allowed to read RenderBox.size is its parent, if they have said they will. It you hit this assert
trying to access a child's size, pass "parentUsesSize: true" to that child's layout().

Another exception was thrown: RenderBox.size accessed beyond the scope of resize, layout, or permitted parent access. RenderBox can always access
its own size, otherwise, the only object that is allowed to read RenderBox.size is its parent, if they have said they will. It you hit this assert
trying to access a child's size, pass "parentUsesSize: true" to that child's layout().

Another exception was thrown: Updated layout information required for RenderViewport#637e1 NEEDS-LAYOUT to calculate semantics.

Another exception was thrown: RenderBox.size accessed beyond the scope of resize, layout, or permitted parent access. RenderBox can always access
its own size, otherwise, the only object that is allowed to read RenderBox.size is its parent, if they have said they will. It you hit this assert
trying to access a child's size, pass "parentUsesSize: true" to that child's layout().

main.dart

Future<void> main() async {
  try {
    WidgetsFlutterBinding.ensureInitialized();
    runApp(MyApp());
  } catch (error, stackTrace) {
    printDebug('$error & $stackTrace');
  }
}

my_app.dart

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return InAppNotification(
      child: MultiProvider(
        providers: getProviders(),
        child: MaterialApp(
          title: 'My App',
          theme: ThemeData(
            visualDensity: VisualDensity.adaptivePlatformDensity,
          ),
          home: Consumer<AuthProvider>(
            builder: (context, provider, child) {
              return provider.loggedIn ? const Home() : const AuthScreen();
            },
          ),
          routes: getRoutes(),
        ),
      ),
    );
  }
}

home.dart

  @override
  void initState() {
    super.initState();

    listenPusher();
  }

  void listenPusher() {
    _pusherSubscription = _pusher.stream.listen((event) {
      switch (event.type) {
        case ChannelType.message:
          // handle
          break;
        case ChannelType.notification:
          printDebug('EVENT FROM NOTIFICATION: ${event.data}');
          InAppNotification.show(
            child: const NotificationBody(),
            context: context,
            onTap: () => print('Notification tapped!'),
            duration: const Duration(milliseconds: 30000),
          );
          break;
      }
    });
  }

It works perfectly, but I want a notification to stay at notification panel on phone. like a WhatsApp notification, which shows and then stays at notification panel. If there is a way to do this, Guide me. Thanks.