Do not propagate_to_hidden RouteFocusChanged events #5797

Job	Run time
cargo clippy+test (wayland)	2m 47s
cargo clippy+test (windows-latest)	3m 45s
druid doctests	1m 10s
cargo clippy+test (macos-latest)	2m 50s
Docs (windows-latest)	2m 6s
mdbook build	1m 49s
Docs (macos-latest)	1m 4s
Docs (ubuntu-latest)	3m 58s
cargo fmt	14s
cargo clippy+test (ubuntu-latest)	3m 7s
cargo clippy+test (gtk)	3m 22s
cargo test (wasm32)	1m 51s
	28m 3s

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