Set `in_progress_merge_commit_sha` for fast-forward merges.
- Closes #900 (closed)
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This flag is used in conjunction with the "Developers can Merge" branch permission, to allow a user to merge MRs without push access to a branch.
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Without this flag set, the user doesn't have access to the protected branch, and the merge fails.
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This flag was previously set for the
Repository#merge
method, but not theRepository#ff_merge
method.