Stack based Merge Queue Breaks when using git history fixup

[harsh183]

Before I started using gh stack, a common workflow I had was using

$ git add -A && git history fixup HEAD && git push --force-with-lease

to make a change onto a pre existing commit stack to keep the history clean. I did this since I like each stack PR to only have a single commit and every small PR response is not making the commit log look really long.

When I do the fixup all the diffs show up well and everything looks great, till I start merging. It enters the merge queue, then rejects due to unrelated history issues. Just doing github PRs based off another PR meant I could still do this though, so I'm not sure if the merge queue is just doing something strange.

#27 I also see a related discussion where the commit fixup flow is not quite working right.