broken font locking in gdb-script-mode

[Tim Van Holder]

In GNU Emacs 22.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.8.16)
 of 2006-05-18 on leeloo
X server distributor `RealVNC Ltd', version 11.0.3370
configured using `configure '--with-gtk' '--with-xpm' '--with-jpeg' 
'--with-gif' '--with-tiff' '--with-png' '--with-x' '--with-kerberos' 
'--with-kerberos5''

gdb-script-mode seems to indiscriminately font-lock the first word of
every line as a keyword.
However it fails to take line continuation into account, so that in
the case of

  set args --foo --bar=baz \
   --xyzzy=/some/path.ext

both 'set' and '--xyzzy=/some/path' get highlighted, while only 'set'
is a gdb statement.
I'm reasonably certain this wasn't the case a while ago (a relatively
long while, I admit - I usually tweak .gdbinits in nano). Perhaps
previously the '-', '/' and '=' would have ended word matching, where
now only the '.' does?