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Fix split diff stale scroll anchor crash#58688

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Anthony-Eid merged 2 commits into
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anthony/fr-59-zed-7s3-called-optionunwrap-on-a-none-value
Jun 5, 2026
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Fix split diff stale scroll anchor crash#58688
Anthony-Eid merged 2 commits into
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anthony/fr-59-zed-7s3-called-optionunwrap-on-a-none-value

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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:

  • I've reviewed my own diff for quality, security, and reliability
  • Unsafe blocks (if any) have justifying comments
  • The content is consistent with the UI/UX checklist
  • Tests cover the new/changed behavior
  • Performance impact has been considered and is acceptable

Release Notes:

  • Fix crash that could occur when unsplitting a side by side diff view

This crash happened when the LHS of a split editor retained a stall
shared anchor when unsplitting the two editors
@cla-bot cla-bot Bot added the cla-signed The user has signed the Contributor License Agreement label Jun 5, 2026
@zed-community-bot zed-community-bot Bot added the staff Pull requests authored by a current member of Zed staff label Jun 5, 2026
@Anthony-Eid Anthony-Eid added this pull request to the merge queue Jun 5, 2026
Merged via the queue into main with commit f1268a1 Jun 5, 2026
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@Anthony-Eid Anthony-Eid deleted the anthony/fr-59-zed-7s3-called-optionunwrap-on-a-none-value branch June 5, 2026 18:28
@Anthony-Eid

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/cherry-pick preview
/cherry-pick stable

zed-zippy Bot added a commit that referenced this pull request Jun 5, 2026
…ble) (#58695)

Cherry-pick of #58688 to stable

----
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

Co-authored-by: Anthony Eid <56899983+Anthony-Eid@users.noreply.github.com>
zed-zippy Bot added a commit that referenced this pull request Jun 5, 2026
…view) (#58694)

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:

- [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

Co-authored-by: Anthony Eid <56899983+Anthony-Eid@users.noreply.github.com>
TomPlanche pushed a commit to TomPlanche/zed that referenced this pull request Jun 8, 2026
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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