rebase: accept multiple --source arguments (BC)...
rebase: accept multiple --source arguments (BC)
I think it's a little surprising that `hg rebase -s A -s B` rebases
only `B::` and ignores `A`. That's because the `-s` flag is not a
repeated flag. This patch makes it a repeated flag.
Differential Revision:
https://phab.mercurial-scm.org/D8292