Force editor to appear for an 'hg backout' if a message or logfile aren't supplied. Pre-fill the commit message with the changeset being backed out. Fixes bug 238.

#!/bin/sh

hg init
python -c 'print "confuse str.splitlines\nembedded\rnewline"' > a
hg ci -Ama -d '1 0'
echo clean diff >> a
hg ci -mb -d '2 0'
hg diff -r0 -r1