xilem: Button with customisable label(text) #2459

Job	Run time
cargo clippy (windows-latest)	31s
cargo clippy (macos-latest)	28s
cargo clippy (wasm32)	1m 51s
cargo clippy (ubuntu-latest)	34s
formatting	11s
cargo check (aarch64-android)	24s
Prime LFS Cache	4s
cargo test (wasm32)	18s
cargo check (msrv) (windows-latest)	1m 57s
cargo check (msrv) (macos-latest)	45s
cargo check (msrv) (wasm32)	19s
cargo doc	46s
cargo check (msrv) (ubuntu-latest)	40s
typos	6s
cargo test (windows-latest)	2m 47s
cargo test (macos-latest)	1m 22s
cargo test (ubuntu-latest)	3m 14s
	16m 17s

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