bug#12463: 24.2; pos-visible-in-window-p gets slower over time

[Eli Zaretskii]

> From: Chong Yidong <cyd@gnu.org>
> Cc: lekktu@gmail.com,  jwalt@garni.ch,  12463@debbugs.gnu.org
> Date: Sat, 22 Sep 2012 19:05:51 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> ***************
> >> *** 8884,8892 ****
> >>     DEFSYM (Qxbm, "xbm");
> >>     ADD_IMAGE_TYPE (Qxbm);
> >>   
> >> -   define_image_type (&xbm_type, 1);
> >> -   define_image_type (&pbm_type, 1);
> >
> > Why are these two lines being removed, while the corresponding
> > ADD_IMAGE_TYPE lines are not?
> 
> This change moves define_image_type into lookup_image_type, so that
> these two image types are handled just like the other image types, for
> simplicity.

Right, I missed that.  Sorry.