A test that creates AdaptiveTextSelectionToolbar with null children fails with 'Null check operator used on a null value'

### Steps to reproduce

Put the following test at the end of the main function in: packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart. Then run `flutter test --verbose packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart`

```dart
  testWidgets('AdaptiveTextSelectionToolBar does not crash at zero area', (
    WidgetTester tester,
  ) async {
    await tester.pumpWidget(
      const MaterialApp(
        home: Center(
          child: AdaptiveTextSelectionToolbar(
            anchors: TextSelectionToolbarAnchors(primaryAnchor: Offset.zero),
            children: null,
          ),
        ),
      ),
    );
  });
```

### Expected results

I think that the test should pass.

### Actual results

The test fails with: 'Null check operator used on a null value'

### Code sample

<details open><summary>Code sample</summary>

```dart
  testWidgets('AdaptiveTextSelectionToolBar does not crash at zero area', (
    WidgetTester tester,
  ) async {
    await tester.pumpWidget(
      const MaterialApp(
        home: Center(
          child: AdaptiveTextSelectionToolbar(
            anchors: TextSelectionToolbarAnchors(primaryAnchor: Offset.zero),
            children: null,
          ),
        ),
      ),
    );
  });
```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

[Upload media here]

</details>


### Logs

<details open><summary>Logs</summary>

```console
[  +22 ms] executing: uname -m
[   +8 ms] Exit code 0 from: uname -m
[        ] x86_64
[   +9 ms] Artifact Instance of 'MaterialFonts' is not required, skipping update.
[        ] Artifact Instance of 'GradleWrapper' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[        ] Artifact Instance of 'FlutterSdk' is not required, skipping update.
[        ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FontSubsetArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'PubDependencies' is not required, skipping update.
[  +13 ms] Found 1 files which will be executed as Widget Tests.
[   +3 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'FlutterEngineStamp' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[   +2 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +60 ms] Artifact Instance of 'MaterialFonts' is not required, skipping update.
[        ] Artifact Instance of 'GradleWrapper' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'FlutterEngineStamp' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[        ] Artifact Instance of 'FlutterSdk' is not required, skipping update.
[        ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FontSubsetArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'PubDependencies' is not required, skipping update.
[  +22 ms] executing: [/mnt/old_home/ahmed/Desktop/flutter/] /mnt/old_home/ahmed/Desktop/flutter/bin/cache/dart-sdk/bin/dart pub --suppress-analytics --color --directory . get
--example
Resolving dependencies... 
Downloading packages... 
  _fe_analyzer_shared 82.0.0 (88.0.0 available)
  adaptive_breakpoints 0.1.7 (discontinued)
  analyzer 7.4.5 (8.1.1 available)
  archive 3.6.1 (4.0.7 available)
  characters 1.4.0 (1.4.1 available)
  code_assets 0.19.4 (0.19.6 available)
  dart_style 3.1.0 (3.1.2 available)
  device_info 2.0.3 (discontinued replaced by device_info_plus)
  ffigen 18.1.0 (19.1.0 available)
  google_fonts 6.2.1 (6.3.1 available)
  google_mobile_ads 5.1.0 (6.0.0 available)
  googleapis 12.0.0 (14.0.0 available)
  googleapis_auth 1.6.0 (2.0.0 available)
  hooks 0.19.5 (0.20.1 available)
  http 1.4.0 (1.5.0 available)
  isolate 2.1.1 (discontinued)
  js 0.7.2 (discontinued)
  material_color_utilities 0.11.1 (0.13.0 available)
  metrics_center 1.0.13 (1.0.14 available)
  native_toolchain_c 0.16.8 (0.17.1 available)
  path_provider_android 2.2.17 (2.2.18 available)
  path_provider_foundation 2.4.1 (2.4.2 available)
  pedantic 1.11.1 (discontinued replaced by lints)
  petitparser 6.1.0 (7.0.1 available)
  process 5.0.4 (5.0.5 available)
  provider 6.1.5 (6.1.5+1 available)
  shelf_web_socket 2.0.1 (3.0.0 available)
  url_launcher_android 6.3.16 (6.3.18 available)
  url_launcher_ios 6.3.3 (6.3.4 available)
  url_launcher_macos 3.2.2 (3.2.3 available)
  video_player_android 2.8.7 (2.8.13 available)
  video_player_avfoundation 2.8.0 (2.8.4 available)
  watcher 1.1.2 (1.1.3 available)
  webview_flutter 4.9.0 (4.13.0 available)
  webview_flutter_android 3.16.9 (4.10.1 available)
  webview_flutter_platform_interface 2.13.1 (2.14.0 available)
  webview_flutter_wkwebview 3.22.1 (3.23.0 available)
  xml 6.5.0 (6.6.1 available)
Got dependencies!
5 packages are discontinued.
33 packages have newer versions incompatible with dependency constraints.
Try `flutter pub outdated` for more information.
[ +820 ms] Found plugin webview_flutter_wkwebview at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter_wkwebview-3.22.1/
[  +17 ms] Found plugin webview_flutter_android at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter_android-3.16.9/
[   +4 ms] Found plugin webview_flutter at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter-4.9.0/
[  +30 ms] Found plugin video_player_web at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_web-2.4.0/
[   +5 ms] Found plugin video_player_avfoundation at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_avfoundation-2.8.0/
[   +2 ms] Found plugin video_player_android at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_android-2.8.7/
[   +2 ms] Found plugin video_player at /home/ahmed/.pub-cache/hosted/pub.dev/video_player-2.10.0/
[   +4 ms] Found plugin url_launcher_windows at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_windows-3.1.4/
[   +5 ms] Found plugin url_launcher_web at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_web-2.4.1/
[   +3 ms] Found plugin url_launcher_macos at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_macos-3.2.2/
[   +1 ms] Found plugin url_launcher_linux at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_linux-3.2.1/
[   +2 ms] Found plugin url_launcher_ios at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_ios-6.3.3/
[   +1 ms] Found plugin url_launcher_android at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_android-6.3.16/
[   +2 ms] Found plugin url_launcher at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher-6.3.2/
[  +50 ms] Found plugin path_provider_windows at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_windows-2.3.0/
[   +4 ms] Found plugin path_provider_linux at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_linux-2.2.1/
[   +1 ms] Found plugin path_provider_foundation at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_foundation-2.4.1/
[   +1 ms] Found plugin path_provider_android at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_android-2.2.17/
[   +1 ms] Found plugin path_provider at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider-2.1.5/
[  +33 ms] Found plugin google_mobile_ads at /home/ahmed/.pub-cache/hosted/pub.dev/google_mobile_ads-5.1.0/
[  +15 ms] Found plugin device_info at /home/ahmed/.pub-cache/hosted/pub.dev/device_info-2.0.3/
[  +37 ms] Found plugin webview_flutter_wkwebview at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter_wkwebview-3.22.1/
[   +6 ms] Found plugin webview_flutter_android at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter_android-3.16.9/
[   +1 ms] Found plugin webview_flutter at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter-4.9.0/
[   +9 ms] Found plugin video_player_web at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_web-2.4.0/
[   +2 ms] Found plugin video_player_avfoundation at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_avfoundation-2.8.0/
[   +2 ms] Found plugin video_player_android at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_android-2.8.7/
[   +1 ms] Found plugin video_player at /home/ahmed/.pub-cache/hosted/pub.dev/video_player-2.10.0/
[   +3 ms] Found plugin url_launcher_windows at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_windows-3.1.4/
[   +1 ms] Found plugin url_launcher_web at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_web-2.4.1/
[        ] Found plugin url_launcher_macos at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_macos-3.2.2/
[        ] Found plugin url_launcher_linux at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_linux-3.2.1/
[        ] Found plugin url_launcher_ios at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_ios-6.3.3/
[        ] Found plugin url_launcher_android at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_android-6.3.16/
[        ] Found plugin url_launcher at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher-6.3.2/
[  +24 ms] Found plugin path_provider_windows at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_windows-2.3.0/
[   +2 ms] Found plugin path_provider_linux at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_linux-2.2.1/
[   +1 ms] Found plugin path_provider_foundation at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_foundation-2.4.1/
[   +1 ms] Found plugin path_provider_android at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_android-2.2.17/
[   +1 ms] Found plugin path_provider at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider-2.1.5/
[  +12 ms] Found plugin google_mobile_ads at /home/ahmed/.pub-cache/hosted/pub.dev/google_mobile_ads-5.1.0/
[   +5 ms] Found plugin device_info at /home/ahmed/.pub-cache/hosted/pub.dev/device_info-2.0.3/
[  +66 ms] No packages with native assets. Skipping native assets compilation.
[   +1 ms] Writing native assets json to file:///mnt/old_home/ahmed/Desktop/flutter/build/native_assets/linux/native_assets.json.
[   +3 ms] Writing /mnt/old_home/ahmed/Desktop/flutter/build/native_assets/linux/native_assets.json done.
[ +333 ms] running test package with arguments: [--chain-stack-traces, --,
file:///mnt/old_home/ahmed/Desktop/flutter/packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart?]
00:00 +0: loading /mnt/old_home/ahmed/Desktop/flutter/packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart                                                 [ +210 ms] test 0: starting test /mnt/old_home/ahmed/Desktop/flutter/packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart
[   +4 ms] Discovered flutter_test_config.dart in /mnt/old_home/ahmed/Desktop/flutter/packages/flutter/test
[   +8 ms] Compiler will use the following file as its incremental dill file: /tmp/flutter_tools.DLLGND/flutter_test_compiler.KMCQEM/output.dill
[        ] Listening to compiler controller...
[   +9 ms] Compiling file:///tmp/flutter_tools.DLLGND/flutter_test_listener.CBHOST/listener.dart
[  +20 ms] Found plugin webview_flutter_wkwebview at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter_wkwebview-3.22.1/
[   +4 ms] Found plugin webview_flutter_android at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter_android-3.16.9/
[   +1 ms] Found plugin webview_flutter at /home/ahmed/.pub-cache/hosted/pub.dev/webview_flutter-4.9.0/
[   +7 ms] Found plugin video_player_web at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_web-2.4.0/
[   +1 ms] Found plugin video_player_avfoundation at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_avfoundation-2.8.0/
[        ] Found plugin video_player_android at /home/ahmed/.pub-cache/hosted/pub.dev/video_player_android-2.8.7/
[        ] Found plugin video_player at /home/ahmed/.pub-cache/hosted/pub.dev/video_player-2.10.0/
[   +1 ms] Found plugin url_launcher_windows at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_windows-3.1.4/
[   +1 ms] Found plugin url_launcher_web at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_web-2.4.1/
[        ] Found plugin url_launcher_macos at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_macos-3.2.2/
[        ] Found plugin url_launcher_linux at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_linux-3.2.1/
[        ] Found plugin url_launcher_ios at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_ios-6.3.3/
[        ] Found plugin url_launcher_android at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher_android-6.3.16/
[        ] Found plugin url_launcher at /home/ahmed/.pub-cache/hosted/pub.dev/url_launcher-6.3.2/
[  +16 ms] Found plugin path_provider_windows at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_windows-2.3.0/
[   +1 ms] Found plugin path_provider_linux at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_linux-2.2.1/
[        ] Found plugin path_provider_foundation at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_foundation-2.4.1/
[        ] Found plugin path_provider_android at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider_android-2.2.17/
[        ] Found plugin path_provider at /home/ahmed/.pub-cache/hosted/pub.dev/path_provider-2.1.5/
[   +8 ms] Found plugin google_mobile_ads at /home/ahmed/.pub-cache/hosted/pub.dev/google_mobile_ads-5.1.0/
[   +5 ms] Found plugin device_info at /home/ahmed/.pub-cache/hosted/pub.dev/device_info-2.0.3/
[  +17 ms] Skipping generating dart_plugin_registrant.dart because it is up-to-date.
[   +4 ms] /mnt/old_home/ahmed/Desktop/flutter/bin/cache/dart-sdk/bin/dartaotruntime
/mnt/old_home/ahmed/Desktop/flutter/bin/cache/dart-sdk/bin/snapshots/frontend_server_aot.dart.snapshot --sdk-root
/mnt/old_home/ahmed/Desktop/flutter/bin/cache/artifacts/engine/common/flutter_patched_sdk/ --incremental --no-print-incremental-dependencies --target=flutter
--experimental-emit-debug-metadata -DFLUTTER_VERSION=3.33.0-1.0.pre-1343 -DFLUTTER_CHANNEL=[user-branch] -DFLUTTER_GIT_URL=git@github.com:ahmedsameha1/flutter.git
-DFLUTTER_FRAMEWORK_REVISION=bfe9dd4729 -DFLUTTER_ENGINE_REVISION=d77a9629f2 -DFLUTTER_DART_VERSION=3.10.0 (build 3.10.0-81.0.dev) --output-dill
/tmp/flutter_tools.DLLGND/flutter_test_compiler.KMCQEM/output.dill --packages /mnt/old_home/ahmed/Desktop/flutter/.dart_tool/package_config.json -Ddart.vm.profile=false
-Ddart.vm.product=false --enable-asserts --track-widget-creation --initialize-from-dill
/mnt/old_home/ahmed/Desktop/flutter/build/test_cache/build/8e3afe6e99b6f1f2325a3fe69f909a29.cache.dill.track.dill --verbosity=error
[  +15 ms] <- compile file:///tmp/flutter_tools.DLLGND/flutter_test_listener.CBHOST/listener.dart
00:01 +0: loading /mnt/old_home/ahmed/Desktop/flutter/packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart                                                 [+1484 ms] <- accept
[        ] <- reset
[        ] Compiling file:///tmp/flutter_tools.DLLGND/flutter_test_listener.CBHOST/listener.dart took 1596ms
[        ] test 0: starting test device
[   +4 ms] test 0: awaiting connection to test device
[   +1 ms] test 0: VM Service uri is not available
[   +5 ms] test 0: test harness socket server is running at port:39073
[   +1 ms] Using this directory for fonts configuration: /tmp/flutter_tools.DLLGND/flutter_test_fonts.CWBOHK
[        ] test 0: Starting flutter_tester process with command=[/mnt/old_home/ahmed/Desktop/flutter/bin/cache/artifacts/engine/linux-x64/flutter_tester, --disable-vm-service,
--enable-checked-mode, --verify-entry-points, --enable-software-rendering, --skia-deterministic-rendering, --enable-dart-profiling, --non-interactive, --use-test-fonts,
--disable-asset-fonts, --packages=/mnt/old_home/ahmed/Desktop/flutter/.dart_tool/package_config.json,
--flutter-assets-dir=/mnt/old_home/ahmed/Desktop/flutter/build/unit_test_assets, /tmp/flutter_tools.DLLGND/flutter_test_listener.CBHOST/listener.dart.dill],
environment={FLUTTER_TEST: true, FONTCONFIG_FILE: /tmp/flutter_tools.DLLGND/flutter_test_fonts.CWBOHK/fonts.conf, SERVER_PORT: 39073, APP_NAME: _flutter_packages,
UNIT_TEST_ASSETS: /mnt/old_home/ahmed/Desktop/flutter/build/unit_test_assets}
[   +6 ms] test 0: Started flutter_tester process at pid 19202
00:02 +0: loading /mnt/old_home/ahmed/Desktop/flutter/packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart                                                 [ +499 ms] test 0: connected to test device, now awaiting test result
[        ] test 0: Waiting for test harness or tests to finish
00:06 +31: AdaptiveTextSelectionToolBar does not crash at zero area                                                                                                            
══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following _TypeError was thrown building AdaptiveTextSelectionToolbar(dirty):
Null check operator used on a null value

When the exception was thrown, this was the stack:
#0      AdaptiveTextSelectionToolbar.build (package:flutter/src/material/adaptive_text_selection_toolbar.dart:306:50)
#1      StatelessElement.build (package:flutter/src/widgets/framework.dart:5791:49)
#2      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5723:15)
#3      Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#4      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:5705:5)
#5      ComponentElement.mount (package:flutter/src/widgets/framework.dart:5699:5)
...     Normal element mounting (231 frames)
#236    Element.inflateWidget (package:flutter/src/widgets/framework.dart:4548:16)
#237    MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:7169:36)
#238    MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:7185:32)
...     Normal element mounting (465 frames)
#703    Element.inflateWidget (package:flutter/src/widgets/framework.dart:4548:16)
#704    Element.updateChild (package:flutter/src/widgets/framework.dart:3998:20)
#705    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#706    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#707    ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#708    _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:108:11)
#709    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#710    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#711    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#712    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#713    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#714    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#715    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#716    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#717    ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#718    _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:108:11)
#719    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#720    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#721    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#722    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#723    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#724    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#725    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#726    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#727    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#728    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#729    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#730    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#731    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#732    ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#733    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#734    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#735    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#736    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#737    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#738    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#739    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#740    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#741    ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#742    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#743    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#744    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#745    ProxyElement.update (package:flutter/src/widgets/framework.dart:6051:5)
#746    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#747    _RawViewElement._updateChild (package:flutter/src/widgets/view.dart:481:16)
#748    _RawViewElement.update (package:flutter/src/widgets/view.dart:568:5)
#749    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#750    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#751    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#752    StatelessElement.update (package:flutter/src/widgets/framework.dart:5797:5)
#753    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#754    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5747:16)
#755    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5884:11)
#756    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#757    StatefulElement.update (package:flutter/src/widgets/framework.dart:5909:5)
#758    Element.updateChild (package:flutter/src/widgets/framework.dart:3982:15)
#759    RootElement._rebuild (package:flutter/src/widgets/binding.dart:1782:16)
#760    RootElement.update (package:flutter/src/widgets/binding.dart:1760:5)
#761    RootElement.performRebuild (package:flutter/src/widgets/binding.dart:1774:7)
#762    Element.rebuild (package:flutter/src/widgets/framework.dart:5435:7)
#763    BuildScope._tryRebuild (package:flutter/src/widgets/framework.dart:2695:15)
#764    BuildScope._flushDirtyElements (package:flutter/src/widgets/framework.dart:2752:11)
#765    BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:3056:18)
#766    AutomatedTestWidgetsFlutterBinding.drawFrame (package:flutter_test/src/binding.dart:1506:19)
#767    RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:495:5)
#768    SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1434:15)
#769    SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1347:9)
#770    AutomatedTestWidgetsFlutterBinding.pump.<anonymous closure> (package:flutter_test/src/binding.dart:1335:9)
#773    TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:74:41)
#774    AutomatedTestWidgetsFlutterBinding.pump (package:flutter_test/src/binding.dart:1324:27)
#775    WidgetTester.pumpWidget.<anonymous closure> (package:flutter_test/src/widget_tester.dart:598:22)
#778    TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:74:41)
#779    WidgetTester.pumpWidget (package:flutter_test/src/widget_tester.dart:595:27)
#780    main.<anonymous closure> (file:///mnt/old_home/ahmed/Desktop/flutter/packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart:433:18)
#781    testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:192:29)
<asynchronous suspension>
#782    TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:1059:5)
<asynchronous suspension>
<asynchronous suspension>
(elided 5 frames from dart:async and package:stack_trace)

════════════════════════════════════════════════════════════════════════════════════════════════════
00:06 +31 -1: AdaptiveTextSelectionToolBar does not crash at zero area [E]                                                                                                     
  Test failed. See exception logs above.
  The test description was: AdaptiveTextSelectionToolBar does not crash at zero area
  

To run this test again: /mnt/old_home/ahmed/Desktop/flutter/bin/cache/dart-sdk/bin/dart test /mnt/old_home/ahmed/Desktop/flutter/packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart -p vm --plain-name 'AdaptiveTextSelectionToolBar does not crash at zero area'
[+3879 ms] test 0: Test harness is no longer needed by test process
[        ] test 0: finished
[   +1 ms] test 0: cleaning up...
[        ] test 0: ensuring test device is terminated.
[        ] test 0: Terminating flutter_tester process
[        ] test 0: Shutting down DevTools server
[        ] test 0: Test process is no longer needed by test harness
[   +1 ms] test 0: Shutting down test harness socket server
[   +9 ms] test 0: flutter_tester process at pid 19202 exited with code=-9
[        ] test 0: deleting temporary directory
[   +5 ms] test 0: finished
00:06 +31 -1: Some tests failed.                                                                                                                                               
[   +6 ms] Deleting /tmp/flutter_tools.DLLGND/flutter_test_compiler.KMCQEM...
[   +5 ms] killing pid 19193
[  +15 ms] Deleting /tmp/flutter_tools.DLLGND/flutter_test_fonts.CWBOHK...
[   +2 ms] test package returned with exit code 1
[        ] Runtime for phase TestRunner: Wall-clock: 0:00:06.291644; combined: 0:00:06.292753.
[        ] Runtime for phase Compile: Wall-clock: 0:00:01.597166; combined: 0:00:01.597200.
[        ] Runtime for phase Run: Wall-clock: 0:00:04.398869; combined: 0:00:04.398872.
[        ] Runtime for phase CoverageTotal: Wall-clock: 0:00:00.000000; combined: 0:00:00.000000.
[        ] Runtime for phase CoverageCollect: Wall-clock: 0:00:00.000000; combined: 0:00:00.000000.
[        ] Runtime for phase CoverageParseJson: Wall-clock: 0:00:00.000000; combined: 0:00:00.000000.
[        ] Runtime for phase CoverageAddHitmap: Wall-clock: 0:00:00.000000; combined: 0:00:00.000000.
[        ] Runtime for phase CoverageDataCollect: Wall-clock: 0:00:00.000000; combined: 0:00:00.000000.
[        ] Runtime for phase WatcherFinishedTest: Wall-clock: 0:00:00.000649; combined: 0:00:00.000651.
[   +8 ms] "flutter test" took 7,925ms.
[   +7 ms] 
           #0      throwToolExit (package:flutter_tools/src/base/common.dart:34:3)
           #1      TestCommand.runCommand (package:flutter_tools/src/commands/test.dart:714:7)
           <asynchronous suspension>
           #2      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1559:27)
           <asynchronous suspension>
           #3      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
           <asynchronous suspension>
           #4      CommandRunner.runCommand (package:args/command_runner.dart:212:13)
           <asynchronous suspension>
           #5      FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:494:9)
           <asynchronous suspension>
           #6      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
           <asynchronous suspension>
           #7      FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:429:5)
           <asynchronous suspension>
           #8      run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:101:11)
           <asynchronous suspension>
           #9      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
           <asynchronous suspension>
           #10     main (package:flutter_tools/executable.dart:105:3)
           <asynchronous suspension>
           
           
[   +1 ms] Running 3 shutdown hooks
[        ] Shutdown hooks complete
[        ] exiting with code 1
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[!] Flutter (Channel [user-branch], 3.33.0-1.0.pre-1343, on Debian GNU/Linux 12 (bookworm) 6.1.0-38-amd64, locale en_US.UTF-8) [208ms]
    ! Flutter version 3.33.0-1.0.pre-1343 on channel [user-branch] at /mnt/old_home/ahmed/Desktop/flutter
      Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
      If that doesn't fix the issue, reinstall Flutter by following instructions at https://flutter.dev/setup.
    ! Warning: `flutter` on your path resolves to /opt/flutter/bin/flutter, which is not inside your current Flutter SDK checkout at /mnt/old_home/ahmed/Desktop/flutter.
      Consider adding /mnt/old_home/ahmed/Desktop/flutter/bin to the front of your path.
    ! Warning: `dart` on your path resolves to /opt/flutter/bin/dart, which is not inside your current Flutter SDK checkout at /mnt/old_home/ahmed/Desktop/flutter. Consider
      adding /mnt/old_home/ahmed/Desktop/flutter/bin to the front of your path.
    ! Upstream repository git@github.com:ahmedsameha1/flutter.git is not a standard remote.
      Set environment variable "FLUTTER_GIT_URL" to git@github.com:ahmedsameha1/flutter.git to dismiss this error.
    • Framework revision bfe9dd4729 (2 weeks ago), 2025-08-14 07:03:26 +0300
    • Engine revision d77a9629f2
    • Dart version 3.10.0 (build 3.10.0-81.0.dev)
    • DevTools version 2.49.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets,
      enable-lldb-debugging
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[!] Android toolchain - develop for Android devices (Android SDK version 35.0.1) [201ms]
    • Android SDK at /home/ahmed/android/android_sdk/
    • Emulator version 35.6.11.0 (build_id 13610412) (CL:N/A)
    ✗ cmdline-tools component is missing.
      Try installing or updating Android Studio.
      Alternatively, download the tools from https://developer.android.com/studio#command-line-tools-only and make sure to set the ANDROID_HOME environment variable.
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/to/linux-android-setup for more details.

[✓] Chrome - develop for the web [23ms]
    • Chrome at google-chrome

[✗] Linux toolchain - develop for Linux desktop [55ms]
    ✗ clang++ is required for Linux development.
      It is likely available from your distribution (e.g.: apt install clang), or can be downloaded from https://releases.llvm.org/
    ✗ CMake is required for Linux development.
      It is likely available from your distribution (e.g.: apt install cmake), or can be downloaded from https://cmake.org/download/
    ✗ ninja is required for Linux development.
      It is likely available from your distribution (e.g.: apt install ninja-build), or can be downloaded from https://github.com/ninja-build/ninja/releases
    ✗ pkg-config is required for Linux development.
      It is likely available from your distribution (e.g.: apt install pkg-config), or can be downloaded from https://www.freedesktop.org/wiki/Software/pkg-config/

[✓] Connected device (2 available) [175ms]
    • Linux (desktop) • linux  • linux-x64      • Debian GNU/Linux 12 (bookworm) 6.1.0-38-amd64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 139.0.7258.138

[✓] Network resources [1,193ms]
    • All expected network resources are available.

! Doctor found issues in 3 categories.

```

</details>


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A test that creates AdaptiveTextSelectionToolbar with null children fails with 'Null check operator used on a null value' #174649

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A test that creates AdaptiveTextSelectionToolbar with null children fails with 'Null check operator used on a null value' #174649

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