tests/histedit-helpers.sh

revset: added __add__ method to _addset

This method is intended to duck-type baseset, so we will still have _addset as a
private class but we will be able to return it without wrapping it into an
orderedlazyset or a lazyset.

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"
}