Fix copy detection corner case We were aborting if the copied from rev was before the cut-off limit, rather than the copied _to_ rev. The copied from rev can be arbitrarily old.

#!/bin/sh

hg init a
echo a > a/a
hg --cwd a ci -A -m a
hg clone a b
echo b > b/b
hg --cwd b ci -A -m b
chmod 100 a/.hg/store
hg --cwd b push ../a
chmod 700 a/.hg/store