editor: Use unbounded shifts for chunk bitmaps (#40879)

This simplifies some code and is also more correct in some others (I
believe some of these might've overflowed causing panics in sentry)

Release Notes:

- N/A *or* Added/Fixed/Improved ...
c81ffaffb6Lukas Wirth committed on 10/22/2025, 11:05:32 AM· committed by GitHubparentbd69124
12 files changedLine totals unavailable