tree 03bd51dd77ce9aeedabda32616a178b77cb98d91
parent c958092c2efee18a6db31a2743cbdc01a850267b
author Harry Terkelsen <1961493+harryterkelsen@users.noreply.github.com> 1710528010 -0700
committer GitHub <noreply@github.com> 1710528010 -0700
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[canvaskit] Fix backdrop filter with platform views as children (#51442)

There is a bug in CanvasKit where a backdrop filter with a platform view
as a child will cause the backdrop filter to apply multiple times. This
change fixes it by only applying the backdrop filter once.

The bug case is more likely to happen since
https://github.com/flutter/engine/pull/47317 landed because when we
encounter an invisible platform view, we always create a new SkPicture
instead of continuing to use the same SkPicture.

BEFORE:

![canvaskit_backdropfilter_with_platformview_BAD](https://github.com/flutter/engine/assets/1961493/c1fa766f-ebf7-4468-9ea7-8ab0d51314c7)

AFTER:

![canvaskit_backdropfilter_with_platformview](https://github.com/flutter/engine/assets/1961493/57d27d62-ee49-43a2-af3f-e532aaba0ffb)


## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
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responsibilities.
- [x] I read and followed the [Flutter Style Guide] and the [C++,
Objective-C, Java style guides].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I added new tests to check the change I am making or feature I am
adding, or the PR is [test-exempt]. See [testing the engine] for
instructions on writing and running engine tests.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I signed the [CLA].
- [x] All existing and new tests are passing.

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on [Discord].

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