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Unclear if this will fix the issues people have been seeing, but it's a start
* Fixed a bug where contentContainer wasn't tracked right * Ensure we cleanup everything on virtualizer.cleanUp * Adds an instance id to Virtualizer to be more consistent with the other components
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Pull request overview
This PR addresses several virtualization edge cases discovered via the OpenCode test implementation, focusing on correcting visibility/render-window calculations and improving lifecycle cleanup to reduce stale state and leaks.
Changes:
- Adjusts window-spec computation to better handle small/zero scrollHeight scenarios and prevent invalid top/bottom windows.
- Fixes Virtualizer sizing/visibility bookkeeping by caching the content container, improving resize debugging, and expanding cleanup/reset behavior.
- Resets cached render ranges on visibility changes and tweaks initial layout/top-offset computation order for virtualized file renderers.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| packages/diffs/src/utils/createWindowFromScrollPosition.ts | Updates window calculation/clamping to avoid stale/invalid render windows. |
| packages/diffs/src/components/Virtualizer.ts | Caches content container, improves visibility bookkeeping, and expands cleanup behavior. |
| packages/diffs/src/components/VirtualizedFileDiff.ts | Resets cached renderRange on visibility changes; adjusts first-render/top computation and debug logging. |
| packages/diffs/src/components/VirtualizedFile.ts | Adjusts first-render/top computation and debug logging to reduce init races/noise. |
| apps/demo/src/main.ts | Adds a demo “Clean” button to invoke instance cleanup. |
| apps/demo/index.html | Adds the “Clean” button to the demo UI. |
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The OpenCode test implementation of virtualization exposed a bunch of subtle bugs around visibility. I'm hopeful these will also fix some of the issues that Conductor was having as well.