That one (in your URL) looks like the result of a PR between mismatched branches. eg instead of being the intended/correct source and destination branch, it's between two branches fairly far apart.

Thus a shed load of commits to try and resolve the difference.

Hopefully this new behaviour does fix the problem. On the other hand, I have a feeling it might alienate potential contributors who just aren't that familiar with git yet and could instead do with some guidance (ie how to use the correct branch to base changes on).

I guess we get to find out. :)