rebase: don't run IMM if running rebase in a transaction Some callers to rebase.rebase(), like `_moverelative` in `fbamend/movement.py`, wrap the entire rebase call in a transaction. This raises havoc when IMM tries to retry the rebase when it hits merge conflicts, because the abort will fail the whole transaction, not the subset. It also fails at the end, losing any conflict resolution, as @sid0 noticed. The right long-term fix that @quark and I have discussed is to change the restarting logic such that it doesn't abort at all, but simply switches between IMM and non-IMM fluidly for each commit, which has other nice properties. In the meantime this will do for now. Differential Revision: https://phab.mercurial-scm.org/D1782