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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
Flow
Flow is a simple compositor based on Skia that the Flutter engine uses to cache recorded paint commands and pixels generated from those recordings. Flow runs on the raster thread and uploads information to Skia.