Update to upstream unbatched PlainEditor #2352

Job	Run time
cargo check (aarch64-android)	21s
cargo clippy (windows-latest)	5m 8s
cargo check (msrv) (windows-latest)	1m 45s
cargo clippy (macos-latest)	3m 40s
cargo check (msrv) (wasm32)	21s
cargo clippy (wasm32)	2m 3s
cargo check (msrv) (macos-latest)	42s
cargo clippy (ubuntu-latest)	3m 27s
cargo check (msrv) (ubuntu-latest)	1m 4s
cargo doc	41s
formatting	1m 36s
Prime LFS Cache	7s
typos	8s
cargo test (wasm32)	27s
cargo test (windows-latest)	4m 15s
cargo test (macos-latest)	2m 0s
cargo test (ubuntu-latest)	6m 2s
	33m 47s

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