I noticed that my patch wasn't handling backslash-quoted whitespace, so
I fixed that.  I then did some testing of filename-matching, and noticed
an improvement:

  % emulate sh
  % touch '1 2'  '3 4'
  % print -l ${1:-*[\ ]*}
  1 2
  3 4

Unpatched zsh would have output "*[" and "]*" on separate lines, which
is the behavior that happens without the backslash (in bash and both
patched/unpatched zsh).

One inconsistency with bash is the handling of '~' -- we no longer split
it if it contains a space, but bash does.  I think I'll just leave this
alone for now.

I added a few more tests to the D04 file.  Attached is the latest
version of the patch.

..wayne..