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When linking in a scene, it's a good idea to specify its clip rectangle to ensure that its content does not draw or capture input from its surrounding space. A future version of the Mozart view manager may automatically wrap a view's scene with a clip rectangle to avoid composition gotchas like this but it currently doesn't. So the net effect is that if you embed a view without specifying a clip, it can draw or capture input from anywhere within its container.
Flow
Flow is a simple compositor based on Skia that the Flutter engine uses to cache recoded paint commands and pixels generated from those recordings. Flow runs on the GPU thread and uploads information to the GPU.