tests/histedit-helpers.sh

extensions: prohibit registration of command without using @command (API)

Detect the problem earlier for better error indication. I'm tired of teaching
users that the mq extension is not guilty but the third-party extension is.

https://bitbucket.org/tortoisehg/thg/issues?q=%27norepo%27

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
}