tests/histedit-helpers.sh

py3: do not pass a memoryview to bdiff.bdiff()

This doesn't look nice, but I don't know how to make a zero-copy slice of
bytes which is compatible with the buffer protocol.

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
}