…after app resumes (#177121)

> [!NOTE]  
> To release engineer: this can definitely wait to be included in a hotfix beta release. I also want to CP this to stable: #177112

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#173770

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Mitigates a memory leak that occurs on Android, when `Activities` are not kept upon exit and an Activity is exited and re-entered.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

Memory leak that will occur in production app but does not impact development.

### Workaround:
Is there a workaround for this issue?

Not that I know of.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

Follow the steps in the [issue description](#173770 (comment)), roughly:

 1. Create a Flutter project.
2. Enter the developer options, set not to keep activities, (destroy each activity as soon as the user leaves it)
3. Entering the activity, clicking the home button, exiting the activity, and then entering the activity again will trigger the destruction and reconstruction of the activity.
4. Check memory leaks through profiler and find memory leaks.

**Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.

… on web-server device (#177456)

**Impacted Users:**
Flutter web developers using the `web-server` device for hot reload/restart.

**Impact Description:**
Hot reload/restart crashes when the browser tab is closed, causing “Bad state: No element” errors and breaking the DWDS connection.

**Workaround:**
Rerun the app.

**Risk:**
Low — changes only affect hot reload/restart handling when no clients are connected.

**Test Coverage:**
Yes — covered by automated integration tests and verified with manual testing across reload/restart scenarios.

**Validation Steps:**

1. run the app on webserver `flutter run -d web-server`
2. open the url
3. do hot reload
4. close the browser
5. do hot reload 

You should see a warning `WebSocketProxyService: No clients available.` along with `Recompile complete. No client connected.` printed in the console. The app should no longer crash.

**Merged PR:** #177026
**Changes in DWDS (Parent PR):** [https://github.com/dart-lang/webdev/pull/2699](https://github.com/dart-lang/webdev/pull/2699)

Fixes #174791

…TK (#177427)

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### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#176360

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Fix accessibility events regression on Linux which makes apps not announced with screen reader.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

The Linux accessibility code was not correctly updated to new API which caused the focus events to no longer be reported. This means using a Linux app with an accessibility tool like a screen reader to not function correctly.

### Workaround:
Is there a workaround for this issue?

No workaround other than using a version of Flutter < 3.25.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

1. Create a basic skeleton app with text buttons
2. Turn on the screen reader
3. Focus a button, and hear announcement when the button gets focus

…iOS 26+ d… (#176976)

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
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### Issue Link:
#176206

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Warns the developer that wireless debugging may be slow on iOS 26

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

Debugging wirelessly on iOS 26 may be slow. This warning suggests that the developer use a wired connection.
Additionally, this will be surfaced in IDEs: Dart-Code/Dart-Code#5730

### Workaround:
Is there a workaround for this issue?

The tool is proposing the workaround.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

Connect an iPhone running iOS 26 wirelessly, `flutter run`.

…ient (#176997)

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### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#176206 / Dart-Code/Dart-Code#5730

This is related to another cherry-pick at #176976. That cherry-pick adds a warning to `flutter run` and this cherry-pick ensures the warning is forwarded correctly to DAP clients (like VS Code).

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Warns the developer that wireless debugging may be slow on iOS 26 in VS Code.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

Debugging wirelessly on iOS 26 may be slow. This change forwards the warning (which is being cherry-picked by #176976) to DAP clients so that it can be shown more prominently in VS Code.

### Workaround:
Is there a workaround for this issue?

This change is to show a workaround for the slow debugging to the user.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

Testing requires using a DAP client. The automated test verifies the event is forwarded, and I tested manually with the Dart-Code changes when I added this change (screenshots at Dart-Code/Dart-Code#5730 (comment)).

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
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### Issue Link:

None

### Changelog Description:

Calling `FileSystemEntity.watch(...)` will throw on Mac OS and Windows.

### Impact Description:

Calling `FileSystemEntity.watch(...)` will throw on Mac OS and Windows, instead of correctly watching the path.

### Workaround:

No user level work-around. `dart:io` is broken.

### Risk:

What is the risk level of this cherry-pick?

### Test Coverage:

Are you confident that your fix is well-tested by automated tests?

It's tested by tests in Dart SDK

### Validation Steps:

Run a Mac OS or Windows app with the following `main`. It should do nothing - rather than throw an exception.

```dart
import 'dart:async';
import 'dart:io';

void main() async {
  final sub = Directory.systemTemp.watch(recursive: true).listen((_) {});
  await Future.delayed(Duration(seconds: 1));
  sub.cancel();
}
```

…n macOS (#177401)

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
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### Issue Link:
What is the link to the issue this cherry-pick is addressing?

There does not appear to be a dedicated issue. The issue description can be found in the PR description:
#176329

The PR fixes a macOS text input crash caused by down-casting the string argument from `Any` to a `NSString`, from [this API](https://developer.apple.com/documentation/appkit/nstextinputclient/inserttext(_:replacementrange:)#parameters). The documentation says it can either be a `NSString` or `NSAttributedString`

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

> Fixes a crash on macOS when the input method (or other services) inserts a `NSAttributedString` instead of `NSString` into a text field.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

App crashes on macOS when interacting with certain IMEs or other system services, if they decided to use `NSAttributedString` instead of `NSString`. It affects production apps.

### Workaround:
Is there a workaround for this issue?

None. Users or app developers have little control over what the IME / services decide to do. The problematic code path in the engine directly interacts with system services so app developer can't workaround that.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

The PR description does not have repro steps. @p1318k could you add the steps to trigger the bug here?

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
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### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#176310

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

`app.dtd` event is not emitted for Flutter web applications run with `--machine`.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

Makes it impossible for tooling to connect to the DTD instance associated with a Flutter web application. This impacts the Flutter MCP extension.

### Workaround:
Is there a workaround for this issue?

No workaround available.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

Run a web application using `flutter run -d chrome --machine` and verify there's an `app.dtd` event once the application has started.

This is a manual cherry pick of #177416 to beta.

**Impacted Users (Approximately who will hit this issue, ex. all Flutter devs, Windows developers, all end-customers, apps using X framework feature).**
Flutter devs who ship to Android. Template versions are changing.

**Impact Description (What is the impact? ex. visual jank on Samsung phones, app crash, cannot ship an iOS app. Does it impact development? ex. flutter doctor crashes when Android Studio is installed. Or shipping a production app? ex. the app crashes on launch).**
Affects flutter build to android.

**Workaround (Is there a workaround for this issue?)**
Use compatible depency versioning.

**Risk (What is the risk level of this cherry-pick?)**
Low

**Test Coverage (Are you confident that your fix is well-tested by automated tests?)**
Yes. Integration tests with new versioning have passed.

**Validation Steps (What are the steps to validate that this fix works?)**
Ran `flutter analyze --suggestions` and `flutter build apk` to verify versioning combination is valid.

---
I bumped templates to the correct versions. I also included a fix for kgp and agp compatability.

AGP 8.11.0 -> 8.11.1
Gradle 8.13 -> 8.14
KGP 2.2.0 -> 2.2.20

I ran `flutter analyze --suggestions` and `flutter build apk` to ensure these are safe versions.

Will cherry pick this to beta after the pr merges.

Fixes #177320

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*Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.*

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#177605)

Fixes #177037 on 3.38 branch. 

This reverts commit 0c0406a.
Leaves `isInvokedFromAndroidStudio`

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request.

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#176462

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Provides guided error message when building for iOS fails due to precompiled headers cache error.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

When using Xcode 26 and switching between branches or upgrading to new beta/stable, it throws an error due to headers of the Flutter framework changing.

### Workaround:
Is there a workaround for this issue?

Run `flutter clean`

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

1. git checkout 3.35.5
2. `flutter create my_app`
3. `flutter build ios`
4. git checkout main
5. `flutter build ios` (it should error)

Updates the `engine.version` to the last commit to touch the engine: d7ec7e8

Verified by the `flutter/bin/internal/last_engine_commit.sh` script.

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