Fix: A symptom of characters being copied when there are multiple TextEdits. #12288

Job	Run time
Check wasm32 + wasm-bindgen	2m 17s
Format + check + test	5m 35s
android	21s
cargo-deny aarch64-apple-darwin	38s
Check Windows	1m 20s
cargo-deny aarch64-linux-android	40s
cargo-deny i686-pc-windows-gnu	38s
cargo-deny i686-pc-windows-msvc	40s
cargo-deny i686-unknown-linux-gnu	39s
cargo-deny wasm32-unknown-unknown	37s
cargo-deny x86_64-apple-darwin	41s
cargo-deny x86_64-pc-windows-gnu	37s
cargo-deny x86_64-pc-windows-msvc	38s
cargo-deny x86_64-unknown-linux-gnu	37s
cargo-deny x86_64-unknown-linux-musl	37s
cargo-deny x86_64-unknown-redox	37s
	17m 12s

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