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During certain partial repaint logic, the backdrop filter layer is present but the filter itself is null. We need to account for it when deciding whether to add such filter to the mutator stack. Fixes https://github.com/flutter/flutter/issues/127095 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
Engine Testing
This directory contains the infrastructure for running tests on the engine, which are most often run by Flutter's continuous integration (CI) systems.
The tests themselves are located in other directories, closer to the source for
each platform, language, and variant. For instance, macOS engine unit tests
written in objective C are located in the same directory as the source files,
but with a Test suffix added (e.g. "FlutterEngineTest.mm" holds the tests for
"FlutterEngine.mm", and they are located in the same directory).
Testing the Engine locally
If you are working on the engine, you will want to be able to run tests locally.
In order to learn the details of how do that, please consult the Flutter Wiki page on the subject.