Context

It can happen that when branching preview branches, a repo might branch before the VMR does.

This can lead to a bad situation where the VMR preview branch contains commits from main that should not be part of it. On an example, the following two commits which had no relation in the original repo (could be conflicting):

but they are parent/child in the VMR.

Instead we want the VMR to branch before and have this situation:

Goal

We should be able to detect that this is happening by determining if the currently synced commit is a child commit of the previously synced one (on the VMR side).

We also need a mechanism to bring this to attention somehow (TBD).