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Shell::OnPlatformViewDispatchPlatformMessage is called on the platform thread and must invoke the message handler on the UI thread. If the platform and UI threads are merged, then the handler can be run immediately. The shell can then post an empty task to the UI thread to make the UI message loop run the task observer that drains the microtask queue.

Fixes flutter/flutter#156595

…handlers and then run microtasks

Shell::OnPlatformViewDispatchPlatformMessage is called on the platform thread
and must invoke the message handler on the UI thread.  If the platform and UI
threads are merged, then the handler can be run immediately.  The shell can
then post an empty task to the UI thread to make the UI message loop run the
task observer that drains the microtask queue.

Fixes flutter/flutter#156595
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It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!).

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

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Testing: this will be tested by reverting flutter/flutter@f1f83aa and verifying that the flutter_gallery__back_button_memory integration test works with the UI/platform thread merge.

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LGTM

@jason-simmons jason-simmons added the autosubmit Merge PR when tree becomes green via auto submit App label Oct 18, 2024
@auto-submit auto-submit bot merged commit 76d310e into flutter:main Oct 18, 2024
engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Oct 18, 2024
auto-submit bot pushed a commit to flutter/flutter that referenced this pull request Oct 18, 2024
flutter/engine@a9bd470...76d310e

2024-10-18 jason-simmons@users.noreply.github.com On a merged UI/platform thread, immediately execute platform message handlers and then run microtasks (flutter/engine#55933)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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Please CC jonahwilliams@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

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jason-simmons added a commit to jason-simmons/flutter that referenced this pull request Oct 21, 2024
auto-submit bot pushed a commit to flutter/flutter that referenced this pull request Oct 21, 2024
nick9822 pushed a commit to nick9822/flutter that referenced this pull request Dec 18, 2024
…handlers and then run microtasks (flutter/engine#55933)

Shell::OnPlatformViewDispatchPlatformMessage is called on the platform thread and must invoke the message handler on the UI thread.  If the platform and UI threads are merged, then the handler can be run immediately.  The shell can then post an empty task to the UI thread to make the UI message loop run the task observer that drains the microtask queue.

Fixes flutter#156595
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[Android] lifecycle events dropped due to thread merging changes.

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