masonry: rename has_focus to subtree_has_focus #1630

Job	Run time
cargo check (aarch64-android)	22s
cargo check (msrv) (wasm32)	23s
cargo clippy (windows-latest)	2m 51s
cargo check (msrv) (windows-latest)	1m 43s
cargo clippy (macos-latest)	1m 9s
cargo clippy (wasm32)	1m 20s
cargo clippy (ubuntu-latest)	1m 52s
cargo doc	1m 40s
cargo check (msrv) (macos-latest)	28s
cargo check (msrv) (ubuntu-latest)	48s
formatting	30s
Prime LFS Cache	4s
cargo test (wasm32)	19s
typos	8s
cargo test (windows-latest)	2m 54s
cargo test (macos-latest)	1m 32s
cargo test (ubuntu-latest)	3m 55s
	21m 58s

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