WIP: Import selection and editing code from Masonry #309

Job	Run time
cargo check (msrv) (windows-latest)	17s
cargo check (msrv) (android) (armv7-linux-androideabi)	19s
cargo check (msrv) (macos-latest)	20s
cargo clippy (windows-latest)	32s
cargo check (msrv) (android) (aarch64-linux-android)	16s
cargo check (msrv) (ubuntu-latest)	17s
cargo clippy (android) (armv7-linux-androideabi)	16s
cargo clippy (macos-latest)	22s
cargo check (msrv) (android) (x86_64-linux-android)	19s
cargo clippy (android) (aarch64-linux-android)	17s
cargo clippy (ubuntu-latest)	19s
cargo clippy (android) (x86_64-linux-android)	14s
cargo doc (windows-latest)	16s
cargo fmt	23s
cargo doc (macos-latest)	15s
cargo test (windows-latest)	19s
cargo doc (ubuntu-latest)	14s
typos	4s
cargo test (macos-latest)	16s
cargo test (ubuntu-latest)	15s
	5m 50s

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