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**Backport:** https://codeberg.org/forgejo/forgejo/pulls/8519 Fixes #8488. The issue was caused by having exactly 20 lines of text between two diff sections, which is `BlobExcerptChunkSize`. The previous diff section ends at 530, the next diff section starts at 551, leaving 20 hidden lines. This triggered an off-by-one error in determining whether a synthetic section should be added to the render to include a new expander; it was falsely being triggered when it shouldn't have been. Mostly correct logic was already present in `GetExpandDirection`, so I changed the `ExcerptBlob` web rendering to use `GetExpandDirection` on whether to include the synthetic section. Then I covered `GetExpandDirection` with unit tests covering all boundary conditions, which discovered one other minor bug -- the case where exactly `BlobExcerptChunkSize` is hidden between two diff sections should never have displayed an "Up" and "Down" expansion, but just a single expander (as below).  Note that *technically* the `ExcerptBlob` change is not covered by any new tests... but the relevant logic has been moved to somewhere more easily testable and fully covered. If this isn't covered enough for tests, let me know. ## Checklist The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org). ### Tests - I added test coverage for Go changes... - [x] in their respective `*_test.go` for unit tests. - [ ] in the `tests/integration` directory if it involves interactions with a live Forgejo server. - I added test coverage for JavaScript changes... - [ ] in `web_src/js/*.test.js` if it can be unit tested. - [ ] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)). ### Documentation - [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change. - [x] I did not document these changes and I do not expect someone else to do it. ### Release notes - [ ] I do not want this change to show in the release notes. - [x] I want the title to show in the release notes with a link to this pull request. - [ ] I want the content of the `release-notes/<pull request number>.md` to be be used for the release notes instead of the title. Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net> Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8523 Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org> Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org> Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org> |
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