WIP: Import selection and editing code from Masonry #235

Job	Run time
cargo clippy (android) (armv7-linux-androideabi)	50s
cargo clippy (windows-latest)	44s
cargo clippy (android) (aarch64-linux-android)	50s
cargo clippy (macos-latest)	37s
cargo clippy (android) (x86_64-linux-android)	50s
cargo clippy (ubuntu-latest)	42s
cargo doc (windows-latest)	1m 11s
cargo fmt	18s
cargo doc (macos-latest)	32s
cargo doc (ubuntu-latest)	36s
cargo check (msrv) (windows-latest)	43s
cargo test (windows-latest)	1m 17s
cargo check (msrv) (android) (armv7-linux-androideabi)	54s
typos	3s
cargo check (msrv) (macos-latest)	38s
cargo test (macos-latest)	23s
cargo check (msrv) (ubuntu-latest)	51s
cargo test (ubuntu-latest)	19s
cargo check (msrv) (android) (aarch64-linux-android)	59s
cargo check (msrv) (android) (x86_64-linux-android)	57s
	14m 14s

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