xilem: Button with customisable label(text) #2460

Job	Run time
cargo clippy (windows-latest)	26s
cargo clippy (macos-latest)	27s
cargo check (aarch64-android)	26s
cargo clippy (wasm32)	2m 2s
cargo clippy (ubuntu-latest)	28s
cargo check (msrv) (windows-latest)	1m 33s
cargo check (msrv) (macos-latest)	45s
formatting	35s
cargo check (msrv) (ubuntu-latest)	46s
Prime LFS Cache	6s
cargo test (wasm32)	24s
cargo check (msrv) (wasm32)	18s
cargo doc	43s
typos	2s
cargo test (windows-latest)	3m 50s
cargo test (macos-latest)	1m 38s
cargo test (ubuntu-latest)	3m 50s
	18m 19s

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