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a797a71dea
With the completion of #12015, when a comment is left on a changed line in a pull request, we track the comment against the line of code with `git blame` and then identify where it currently is in any diff with `git blame --reverse`. However, this strategy only works for the *modified* lines of code -- eg. the `+...` in diffs, and not the `-...` in diffs. The reason is that `git blame --reverse` can't track a line of code's location past the commit that it was removed in. To permit comments that are left on lines of code that are removed to appear correctly in the UI, a separate approach is required for those comments. This PR performs two major changes, which have been complex to figure out, but are reasonably easy to understand: - When a comment is placed on a removed line in a PR, perform a `git blame --reverse` from the PR's base to the currently viewed commit, and use this information to record in the comment: - the **last commit that the line of code existed in** (stored in the `commit_sha` field) - the **line of code as of that commit** (stored in the `line` field, negative, to indicate that the comment is on a removal). - the **patch** where the comment was placed (stored in the field `patch`); existing functionality unchanged in this PR - When viewing any diff in the PR, for each comment on a removal, perform a diff from the `commit_sha` (last commit that the line of code existed in) to the current commit being viewed, and verify that within that diff the left-hand-side line removal still exists at the same line of code in the diff, by comparing the current diff with the stored patch. - If present, place the commit in the UI at the line number. - If the line of code no longer exists in the diff at that point (for example, it was removed, commented upon, and then re-added in a later commit), then the comment is considered outdated and isn't displayed. The algorithm used for marking a comment as "outdated" is also updated to use this approach. ## Checklist The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. All work and communication must conform to Forgejo's [AI Agreement](https://codeberg.org/forgejo/governance/src/branch/main/AIAgreement.md). 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 for Go changes - I added test coverage for Go changes... - [x] in their respective `*_test.go` for unit tests. - [x] in the `tests/integration` directory if it involves interactions with a live Forgejo server. - I ran... - [x] `make pr-go` before pushing ### 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 - [x] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change. - [ ] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change. Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12092 Reviewed-by: Andreas Ahlenstorf <aahlenst@noreply.codeberg.org> Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net> Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net> |
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