Fix tree-structure tracking in `AnyView` and `ScrollView` #185

Job	Run time
cargo fmt	14s
cargo doc (windows-latest)	2m 46s
cargo clippy + test (windows-latest)	1m 50s
cargo doc (macos-latest)	1m 38s
cargo clippy + test (macos-latest)	1m 44s
cargo doc (ubuntu-latest)	1m 56s
cargo clippy + test (ubuntu-latest)	1m 12s
	11m 20s

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