bug#23246: 25.0.92; Local face-remapping-alist doesn't affect tooltips

[martin rudalics]

>> `x-show-tip' just might work.
>
> You mean, tooltip-functions doesn't?

The doc-string of ‘x-show-tip’ advises that

  This is an internal function; Lisp code should call ‘tooltip-show’.

but ‘tooltip-show’ overrides any face properties of TEXT via

  (propertize text 'face 'tooltip)

in a hardcoded fashion.  So if you want to display your own face
attributes, you currently have to call ‘x-show-tip’ directly despite of
its advice.

Obviously, GTK+ (and probably OS X) tooltips override such attributes
anyway, so changing this might probably never given high priority.
Still, Emacs tooltip frames provide the possibility so why not use it?

martin