Store label selection state per viewport #12003

Job	Run time
Check wasm32 + wasm-bindgen	2m 17s
Format + check + test	5m 24s
android	30s
cargo-deny aarch64-apple-darwin	38s
Check Windows	2m 12s
cargo-deny aarch64-linux-android	42s
cargo-deny i686-pc-windows-gnu	48s
cargo-deny i686-pc-windows-msvc	47s
cargo-deny i686-unknown-linux-gnu	41s
cargo-deny wasm32-unknown-unknown	38s
cargo-deny x86_64-apple-darwin	40s
cargo-deny x86_64-pc-windows-gnu	41s
cargo-deny x86_64-pc-windows-msvc	45s
cargo-deny x86_64-unknown-linux-gnu	42s
cargo-deny x86_64-unknown-linux-musl	38s
cargo-deny x86_64-unknown-redox	37s
	18m 40s

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