gdb-ui.el assumes images support

[Nick Roberts]

 > ...(why does tooltip.el need to require gdb-ui, anyway?).

tooltip.el doesn't require gdb-ui. 

emacs -q

`C-h v' features

features's value is 
(help-fns help-mode view button tooltip image tool-bar disp-table mwheel x-dnd 
fontset ediff-hook vc-hooks lisp-float-type lisp-mode register page menu-bar 
timer select scroll-bar mldrag mouse facemenu font-core frame ucs-tables 
georgian utf-8-lang misc-lang vietnamese tibetan thai lao korean japanese 
hebrew greek romanian slovak czech european ethiopic kannada tamil malayalam 
devanagari indian cyrillic chinese case-table help simple faces cus-face 
text-properties overlay md5 base64 format mule env custom widget backquote 
make-network-process x-toolkit)

tooltip is present, while gdb-ui isn't.

You are probably referring to the fact that tooltip does require gdb-ui for
compilation (eval-when-compile). tooltip.el contains lisp functions from
gdb-ui.el like gdb-enqueue-input and as someone had already `required' gud for
compilation I followed suit and added gdb-ui. Is this what is causing the
problem?

I'm not a lisp expert but there is only one macro in tooltip.el
(tooltip-region-active-p) which doesn't use functions from gud or gdb-ui, so
perhaps these requires aren't necessary? Anyone?

Nick