compadd -qS' ' should escape the space

["Nikolai Weibull" <now@xxxxxxxx>]

The following code will only do the right thing if I have started the
current word with a ":

 declare -a colors

 colors=(black red green yellow blue magenta cyan white)

 _describe -t color 'color' colors -qS' '

I'd expect the space used as a suffix to be escaped.

Thanks.

 nikolai