Jason Simmons
af511babc7
Prerolling a layer can have side effects. In particular, PlatformViewLayer::Preroll will call view_embedder->PrerollCompositeEmbeddedView. Clip layers will check whether the layer's children are all clipped and if so will skip calling Preroll on the children. However, the Paint implementation in these layers was always calling Paint on their children. This could result in a call to PlatformViewLayer::Paint without a corresponding call to PlatformViewLayer::Preroll. This translates to a CompositeEmbeddedView call without a PrerollCompositeEmbeddedView call on the affected view_id. The EmbedderExternalViewEmbedder implementation does not allow that. With this change, clip layers will only call PaintChildren if the preroll called PrerollChildren. See https://github.com/flutter/flutter/issues/46111
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