Eric's hints haven't fallen on deaf ears :-)
Not sure if it makes sense to push new tests to the 2.5 branch or
not but on balance I'm inclined to do it as it reduces the chances
of regressions.
1 patch for repository http://darcs.net/releases/branch-2.5:
Fri Jan 7 20:40:59 GMT 2011 Ganesh Sittampalam <ganesh@earth.li>
* hunk editing test