bug#4394: 23.1; flashing when overlapping face and mouse-face properties

[Eli Zaretskii]

> Date: Sun, 18 Jul 2021 22:11:29 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: monnier@iro.umontreal.ca, 4394@debbugs.gnu.org
> 
> > From: Lars Ingebrigtsen <larsi@gnus.org>
> > Date: Sun, 18 Jul 2021 21:06:57 +0200
> > Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 4394@debbugs.gnu.org
> > 
> > The point of the mouse face is to tell the user that they can mouse-2 on
> > the region to expand the abbreviated bits.  (This is done in
> > `last-sexp-setup-props'.)
> > 
> > However, when the sexp is large, the mouse face is indeed very annoying.
> > Would it make sense to shorten it somehow?  For instance, only display
> > it over the "..." to indicate that it's the abbreviation that the mouse
> > face is trying to draw attention to?  Or...  something else?
> > 
> > Like...  er...  adding underlines or something to the dots and not using
> > a mouse face at all?  Or underlines and a mouse face, but just for the
> > dots...
> > 
> > Anybody got an opinion?
> 
> My opinion is that we should leave this alone.

Btw, here the highlight stops at the right parentheses, it doesn't go
to the right edge of the window.