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write/edit freezes when writing long content ("Preparing write..." hangs) #20477
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Description
Description
When writing or editing files with a large number of lines, the TUI freezes on "Preparing write..." / "Preparing patch..." for several seconds before the permission prompt appears.
Root cause: createTwoFilesPatch (Myers diff, O(N²) in line count) runs synchronously on the main thread before ctx.ask(), blocking the Node.js event loop when content has many lines.
Also observed on Windows: apply_patch throws EEXIST from fs.mkdir when the target directory already exists (Bun 1.3.x bug with recursive:true).
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github-actions commentedon Apr 1, 2026
This issue might be a duplicate of existing issues. Please check:
If your issue is the same as one of these, please comment there instead so efforts can be consolidated.
github-actions commentedon Jul 4, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.