Fix split diff stale scroll anchor crash (#58688) (cherry-pick to preview)#58694
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This crash occurred when the left hand side (LHS) editor in the split diff retained a stale shared scroll handler after the split editor unsplits. I added an invariant check to our randomized companion display map tests to prevent regressions here and explicitly make LHS editor set a native scroll anchor when unsplitting. Self-Review Checklist: - [x] I've reviewed my own diff for quality, security, and reliability - [x] Unsafe blocks (if any) have justifying comments - [x] The content is consistent with the [UI/UX checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) - [x] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable Release Notes: - Fix crash that could occur when unsplitting a side by side diff view
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Cherry-pick of #58688 to preview
This crash occurred when the left hand side (LHS) editor in the split
diff retained a stale shared scroll handler after the split editor
unsplits. I added an invariant check to our randomized companion display
map tests to prevent regressions here and explicitly make LHS editor set
a native scroll anchor when unsplitting.
Self-Review Checklist:
checklist
Release Notes: