Fix: Scroll doesn't work or is inaccurate in `ScrollArea` #13123

Job	Run time
android	27s
Check wasm32 + wasm-bindgen	2m 37s
cargo-deny aarch64-apple-darwin	48s
cargo-deny aarch64-linux-android	40s
Check wasm32+atomics	1m 17s
cargo-deny i686-pc-windows-gnu	42s
cargo-deny i686-pc-windows-msvc	38s
Format + check + test	2m 41s
cargo-deny i686-unknown-linux-gnu	45s
cargo-deny wasm32-unknown-unknown	37s
cargo-deny x86_64-apple-darwin	39s
ios	26s
cargo-deny x86_64-pc-windows-gnu	39s
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	39s
Run tests	1m 27s
Check Windows	2m 13s
	19m 7s

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