Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.

[Gobink6]

../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/focus_detector-2.0.1/lib/focus_detector.dart:54:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/widgets/binding.dart'). WidgetsBinding.instance?.addObserver(this); ^ ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/focus_detector-2.0.1/lib/focus_detector.dart:162:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/widgets/binding.dart'). WidgetsBinding.instance?.removeObserver(this); ^ ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.2/lib/src/visibility_detector_layer.dart:126:28: Warning: Operand of null-aware operation '?.' has type 'RendererBinding' which excludes null.
• 'RendererBinding' is from 'package:flutter/src/rendering/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/rendering/binding.dart'). assert(RendererBinding.instance?.renderView != null); ^ ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.2/lib/src/visibility_detector_layer.dart:127:50: Warning: Operand of null-aware operation '!' has type 'RendererBinding' which excludes null.
• 'RendererBinding' is from 'package:flutter/src/rendering/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/rendering/binding.dart'). var clipRect = Offset.zero & RendererBinding.instance!.renderView.size; ^ ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.2/lib/src/visibility_detector_layer.dart:170:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/scheduler/binding.dart'). SchedulerBinding.instance!.addPostFrameCallback((timeStamp) { ^ ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.2/lib/src/visibility_detector_layer.dart:193:22: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/scheduler/binding.dart'). SchedulerBinding.instance!

[RGPaul]

see https://github.com/EdsonBueno/focus_detector/issues/12#issuecomment-1187296367 for a workaround