Automatically rebase merge request when target branch is automatically retargeted

Description

Noticed on .com in this MR !55283 (merged)

I also noticed that at the time of writing this the MR's .diff includes 6 changes:

55283.diff

Also running git diff origin/master...origin/BRANCH_NAME --stat showed that there were 6 file changes 🤷

Investigation

• Maybe the fact that this MR was retargeted is related 🤔

• Even creating a new MR from a copy of the branch didn't work !55611 (closed).

• It took squashing the commits and rebasing for the counts to align !55613 (closed).