84 lines
3.6 KiB
Markdown
84 lines
3.6 KiB
Markdown
---
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stage: none
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group: unassigned
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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type: reference, concepts
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---
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# Merge requests versions
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Every time you push to a branch that is tied to a merge request, a new version
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of merge request diff is created. When you visit a merge request that contains
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more than one pushes, you can select and compare the versions of those merge
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request diffs.
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## Selecting a version
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By default, the latest version of changes is shown. However, you
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can select an older one from version dropdown.
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Merge request versions are based on push not on commit. So, if you pushed 5
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commits in a single push, it displays as a single option in the dropdown. If you
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pushed 5 times, that counts for 5 options.
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You can also compare the merge request version with an older one to see what has
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changed since then.
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Comments are disabled while viewing outdated merge versions or comparing to
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versions other than base.
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Every time you push new changes to the branch, a link to compare the last
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changes appears as a system note.
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## Find the merge request that introduced a change
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> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/2383) in GitLab 10.5.
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When viewing the commit details page, GitLab links to the merge request (or
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merge requests, if it's in more than one) containing that commit.
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This only applies to commits that are in the most recent version of a merge
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request - if commits were in a merge request, then rebased out of that merge
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request, they aren't linked.
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## `HEAD` comparison mode for merge requests
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> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/27008) in GitLab 12.10.
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Merge requests, particularly the **Changes** tab, is where source code
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is reviewed and discussed. In circumstances where the target branch was
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merged into the source branch of the merge request, the changes in the
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source and target branch can be shown mixed together making it hard to
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understand which changes are being added and which already exist in the
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target branch.
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In GitLab 12.10, we added a comparison mode, which
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shows a diff calculated by simulating how it would look like once merged - a more accurate
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representation of the changes rather than using the base of the two
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branches. The new mode is available from the comparison target drop down
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by selecting **master (HEAD)**. In GitLab 13.9, it
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[replaced](https://gitlab.com/gitlab-org/gitlab/-/issues/198458) the
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old default comparison. For technical details, additional information is available in the
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[developer documentation](../../../development/diffs.md#merge-request-diffs-against-the-head-of-the-target-branch).
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