Word boundaries in wdired mode

[Henrik Enberg]

There's something screwy about word boundries in wdired mode.  Say I
have the following files in a directory:

FOO.EXT
BAR.EXT
BAZ.EXT

If I try to downcase them by placing point on F and hitting "M-l" a
number of times, then I end up with this:

foo.ext
BAR.ext
BAZ.ext

The first two M-l work as expected, but the next two skips over BAR and
BAZ respectively.