rebase: reduce scope of a variable Differential Revision: https://phab.mercurial-scm.org/D3940

context: rename descendant() to isancestorof() This makes the direction much clearer, IMO. Differential Revision: https://phab.mercurial-scm.org/D3936

copies: delete now-unnecessary check for "a == b" before "a.descendant(b)" Unnecessary since 879cbdde63df (revlog: do inclusive descendant testing (API), 2018-06-21). Differential Revision: https://phab.mercurial-scm.org/D3935

revlog: delete isdescendantrev() in favor of isancestorrev() As agreed on by Boris, Yuya, and me on D3929. Differential Revision: https://phab.mercurial-scm.org/D3934

rebase: add --confirm option This feature adds a functionality in rebase to confirm before applying changes. When there is no conflict and user confirm to apply actions, we just finish the unfinished rebase. But when there is a conflict and user confirm to apply actions then we can't just finish rebasing using rbsrt._finishrebase() because in-memory merge doesn't support conflicts, so we have to abort and run on-disk merge in this case. And if user doesn't confirm to apply actions then simply abort the rebase. Differential Revision: https://phab.mercurial-scm.org/D3870

revlog: introduce a isancestorrev() and use it in rebase Differential Revision: https://phab.mercurial-scm.org/D3931

revlog: make isdescendantrev(a, b) check if a < b This check was taken from rebase.py. It seems to make sense to move it here, but I haven't done any measurements. Differential Revision: https://phab.mercurial-scm.org/D3930