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[ci no changelog needed] This is fixed copy of already reviewed #3384 [Task link](https://www.pivotaltracker.com/story/show/181413200) This PR implements content clipping for the ScrollArea component. List of changes: - Implemented `InstanceWithAttachedLayer` abstraction that allows creating additional sublayers for our components. In the future, this abstraction can be used for text rendering as well (right now text rendering requires additional hardcoded layers). - Fixed `complex-shape-system` demo scene by removing `node_searcher_mask` layer. - Fixed `SublayersModel::remove` - it was not clearing the `layer_placement` hashmap. - Implemented disabling the wheel scrolling in `Navigator`, and refactored it to reduce the number of functions arguments by introducing a `NavigatorSettings` struct. Video (`scroll_area` demo): https://user-images.githubusercontent.com/6566674/164506455-e177a7a7-9f1c-4f50-888f-112423cebbe4.mp4 # Important Notes - `InstanceWithAttachedLayer` is implemented in such a way that it allows an extension in the future - namely to use it to simplify text rendering. The implementation might be simplified though. |
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