If the upstream branch already contains a change you have made (e.g.,
because you mailed a patch which was applied upstream), then that commit
will be skipped. For example, running `git rebase master` on the
-following history (in which A' and A introduce the same set of changes,
+following history (in which `A'` and `A` introduce the same set of changes,
but have different committer information):
------------
-p::
--preserve-merges::
- Instead of ignoring merges, try to recreate them.
+ Recreate merge commits instead of flattening the history by replaying
+ commits a merge commit introduces. Merge conflict resolutions or manual
+ amendments to merge commits are not preserved.
+
This uses the `--interactive` machinery internally, but combining it
with the `--interactive` option explicitly is generally not a good