rebase: extract function for rebasing a single node...
rebase: extract function for rebasing a single node
We currently have _performrebase() and _performrebasesubset(), but we
don't have a method for rebasing a single node (that's inside a loop
in _performrebasesubset()). I think it makes sense to have such a
method, so that's what this patch does. I think it may simplify future
patches I'm working on that have to do with transactions, but I think
this patch makes sense on its own whether or not that future work
happens.
Differential Revision:
https://phab.mercurial-scm.org/D2809
