Fix tab focus when no widget is currently focused #1524

Job	Run time
Prime LFS Cache	4s
cargo test (wasm32)	20s
cargo clippy (wasm32)	59s
formatting	33s
cargo clippy (windows-latest)	3m 23s
cargo clippy (macos-latest)	1m 13s
cargo clippy (ubuntu-latest)	1m 37s
cargo check (msrv) (windows-latest)	2m 31s
cargo check (msrv) (wasm32)	16s
cargo check (msrv) (macos-latest)	41s
cargo check (aarch64-android)	22s
cargo check (msrv) (ubuntu-latest)	32s
cargo doc	1m 27s
typos	5s
cargo test (windows-latest)	3m 11s
cargo test (macos-latest)	1m 38s
cargo test (ubuntu-latest)	4m 2s
	22m 54s

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