Merge queue not clearing completed author merges

[mheiman]

Problem

At some point (looks like maybe November — I never ran into before then) successful author merges are not always being automatically removed from the merge queue when they are completed. It seems to affect mainly complicated merges, where the merger may have to complete the merge in stages to clear up errors along the way.

What one is left with is a merge request that points to a single author, and therefore can no longer be closed by merging.

The merge queue currently has about 20 of these, which I've marked "Merged, but won't delete."

Reproducing the bug

I can't find any consistent set of steps that causes or prevents this behavior.

Context

• Logged in (Y/N): Y
• Environment (prod, dev, local): prod

Breakdown

I haven't done any work on the merge queue, so I'm not going to speculate about what's going wrong.

If we can't track down the problem, having an interface to manually close items would be a reasonable fix.

Stakeholders

@jimchamp @seabelis

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