zsh_completion: handle --rev as well as -r for diff and revert
Completion for hg diff and revert should suggest all files in context of a
non-current revision. The script used to look only for `-r foo`, and now it
also understands `--rev foo`.
Differential Revision: https://phab.mercurial-scm.org/D4427
fixbundle() {
grep -v 'saving bundle' | grep -v 'saved backup' | \
grep -v added | grep -v adding | \
grep -v "unable to find 'e' for patching" | \
grep -v "e: No such file or directory" | \
cat
}