tests/histedit-helpers.sh

test-revlog: test a repository that contains a diff against nullrev

We are witnessing a crash in the rust code, so we lets make sure this case is
tested.

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
}