[Atralbus]

Hi,
I thought it might increase the controllability if we pass the event as an argument to onScrollToChange function. For example; if we want to use event.shiftKey | event.ctrlKey for a different behavior.

• The existing test suites (npm test) all pass
• For any new features or bug fixes, both positive and negative test cases have been added
• For any new features, documentation has been added
• For any documentation changes, the text has been proofread and is clear to both experienced users and beginners.
• Format your code with prettier (yarn run prettier).
• Run the Flow typechecks (yarn run typecheck).

[bvaughn]

Sorry for the very long delay in getting back to you about this!

I've just finished a large update for version 10 of react-virtualized (#1900): the library has been rewritten in TypeScript, every component is now a function component (React 18+ is required), and the source moved from source/ to lib/. Because of that, this PR can't be merged as-is. Version 10's ArrowKeyStepper still passes only the indices to onScrollToChange.

If you're still interested in this change, I'd welcome a new PR with it rebased onto the version-10 branch (or onto master once version 10 has been merged).