Backing Out a backwards merge on Mercurial

Question

How do you reverse the effect of a merge on polarised branches without dying of agony?

This problem has been plaguing me for months and I have final

Answer 1

So you want to merge just some changesets from B into A? Backing out changesets like you have been doing is a really bad idea as you have already suffered.

You should either use the transplant extension or have a third branch where you make common changes to merge into both A and B.