Fix tree-structure tracking in `AnyView` and `ScrollView` #183

Job	Run time
cargo fmt	14s
cargo doc (windows-latest)	1m 24s
cargo clippy + test (windows-latest)	2m 4s
cargo doc (macos-latest)	1m 3s
cargo clippy + test (macos-latest)	1m 44s
cargo doc (ubuntu-latest)	36s
cargo clippy + test (ubuntu-latest)	1m 15s
	8m 20s

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