Update to upstream unbatched PlainEditor (#766) #2355

Job	Run time
Prime LFS Cache	4s
cargo clippy (windows-latest)	8m 52s
cargo clippy (macos-latest)	4m 38s
cargo check (msrv) (wasm32)	32s
cargo check (msrv) (windows-latest)	2m 51s
cargo clippy (ubuntu-latest)	5m 36s
cargo check (aarch64-android)	1m 42s
cargo check (msrv) (macos-latest)	1m 50s
cargo clippy (wasm32)	3m 42s
cargo check (msrv) (ubuntu-latest)	1m 51s
cargo test (wasm32)	1m 0s
formatting	27s
typos	7s
cargo doc	2m 2s
cargo test (windows-latest)	6m 59s
cargo test (macos-latest)	2m 53s
cargo test (ubuntu-latest)	6m 13s
	51m 19s

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