Fix merge base commit for fast-forwarded GitLab PRs #27825
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* giteaofficial/main: List all Debian package versions in `Packages` (go-gitea#27786) Fix merge base commit for fast-forwarded GitLab PRs (go-gitea#27825) Fix bad method call when deleting user secrets via API (go-gitea#27829) Change katex limits (go-gitea#27823) Dockerfile small refactor (go-gitea#27757) Use GitLab's squash_commit_sha when available (go-gitea#27824) [skip ci] Updated translations via Crowdin Upgrade xorm to 1.3.4 (go-gitea#27807)
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Due to a bug in the GitLab API, the diff_refs field is populated in the response when fetching an individual merge request, but not when fetching a list of them. That field is used to populate the merge base commit SHA. While there is detection for the merge base even when not populated by the downloader, that detection is not flawless. Specifically, when a GitLab merge request has a single commit, and gets merged with the squash strategy, the base branch will be fast-forwarded instead of a separate squash or merge commit being created. The merge base detection attempts to find the last commit on the base branch that is also on the PR branch, but in the fast-forward case that is the PR's only commit. Assuming the head commit is also the merge base results in the import of a PR with 0 commits and no diff. This PR uses the individual merge request endpoint to fetch merge request data with the diff_refs field. With its data, the base merge commit can be properly set, which—by not relying on the detection mentioned above—correctly imports PRs that were "merged" by fast-forwarding the base branch. ref: https://gitlab.com/gitlab-org/gitlab/-/issues/29620
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Due to a bug in the GitLab API, the diff_refs field is populated in the response when fetching an individual merge request, but not when fetching a list of them. That field is used to populate the merge base commit SHA.
While there is detection for the merge base even when not populated by the downloader, that detection is not flawless. Specifically, when a GitLab merge request has a single commit, and gets merged with the squash strategy, the base branch will be fast-forwarded instead of a separate squash or merge commit being created. The merge base detection attempts to find the last commit on the base branch that is also on the PR branch, but in the fast-forward case that is the PR's only commit. Assuming the head commit is also the merge base results in the import of a PR with 0 commits and no diff.
This PR uses the individual merge request endpoint to fetch merge request data with the diff_refs field. With its data, the base merge commit can be properly set, which—by not relying on the detection mentioned above—correctly imports PRs that were "merged" by fast-forwarding the base branch.
ref: https://gitlab.com/gitlab-org/gitlab/-/issues/29620