Fix tree-structure tracking in `AnyView` and `ScrollView` #184

Job	Run time
cargo fmt	12s
cargo doc (windows-latest)	1m 30s
cargo clippy + test (windows-latest)	49s
cargo doc (macos-latest)	57s
cargo clippy + test (macos-latest)	55s
cargo doc (ubuntu-latest)	42s
cargo clippy + test (ubuntu-latest)	44s
	5m 49s

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