* Roll flutter engine to a24c7c13925e4e3282f7b85814b70e63782fa057

This PR changes the Config class in flutter_tools to use the XDG Base directory specification instead of putting files directly in the user's home directory. If those files are already present in the home directory, they are used instead.

This reverts commit 81439922.

Refactors the desktop devices and workflow to remove unnecessary usage of global variables. This should make it easier to test and continue enhancing the desktop functionality of the tooling

#47161

[null-safety] add integration tests for sound null safety modes, add support for sound null safety in dart2js (#67171)

Add integration tests to verify that ddc and dart2js can be built and run in sound mode. Updates dart2js compilation to insert a language version comment into the generated entrypoint if necessary.

dart-lang/sdk#42253

Flutter logs should not attempt to filter the device list based on the current project, because it does not require a current project. Also fix disabled polling test

Fixes #47996
Fixes #63550

Force opt-in flutter test platform to null safety for repo testing

* PointerEvent.local* properties are calculated lazily; other properties are delegated to original.
* Transformed PointerEvent becomes a subclass of its original class.
* Unnamed constructors no longer accepts transform and origin.

* migrate some material files to nullsafety

* review

This adds the neccessary synthetic move/hover events to
resampler, which is needed for position to not change as
part of a down, up, or remove event.
Co-authored-by: David Reveman <reveman@google.com>

No matter what level(error, warning, info) issues flutter analyze always return fatal exit code(1). CI/CD environment receive 1(!0). This may leads to e.g. Jenkins Build step 'Execute shell' marked build as failure.
I propose according to AnalysisSeverity level return fatal(1) or success(0) exit code.

* Revert "docs for image disposal (#67066)"

This reverts commit bcb2ac5a.

* Revert "Dispose of images after using them (#66688)"

This reverts commit a7954691.

Fixes https://github.com/flutter/flutter/issues/66569

SkParagraph may calculate slightly different metrics for text layouts

* Dispose of images after using them
Adds ImageInfo.clone, ImageInfo.dispose, and ImageInfo.isCloneOf.
Makes all stateful holders of ui.Image objects properly clone and dispose of them.
Behavior change for ImageStreamCompleter: Removing the last listener after registering at least one listener results in the object being disposed, and new listeners cannot be added, unless a keepAlive handle is created.
Makes all non-stateful holders of ui.Image (i.e. paintImage and RawImage) assert that whoever gave the image to them has not disposed it on them.

* migrate some material files to nullsafety

* fix test_private

* address review comments

* fix private test on windows

* use uri in include entry of analysis_options