fix qrefresh'ing an empty patch
This is not superefficient (the commit will have to walk the whole tree),
but it works.
#!/bin/bash
# http://www.selenic.com/mercurial/bts/issue352
hg init foo
cd foo
A=`echo -e -n 'he\rllo'`
echo foo > "hell
o"
echo foo > "$A"
hg add
hg ci -A -m m
rm "$A"
ls
hg add
# BUG ? we don't walk on filenames with '\n' (regexp related) ?
hg debugwalk
hg ci -A -m m
exit 0