Fix: dragging to above/below a galley will select text to begin/end #8756

Job	Run time
android	28s
cargo-deny aarch64-apple-darwin	38s
cargo-deny aarch64-linux-android	39s
Check wasm32 + wasm-bindgen	2m 23s
Format + check + test	5m 33s
Check Windows	2m 6s
cargo-deny i686-pc-windows-gnu	35s
cargo-deny i686-pc-windows-msvc	37s
cargo-deny i686-unknown-linux-gnu	40s
cargo-deny wasm32-unknown-unknown	40s
cargo-deny x86_64-apple-darwin	39s
cargo-deny x86_64-pc-windows-gnu	42s
cargo-deny x86_64-pc-windows-msvc	40s
cargo-deny x86_64-unknown-linux-gnu	36s
cargo-deny x86_64-unknown-linux-musl	39s
cargo-deny x86_64-unknown-redox	41s
	18m 16s

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