bug#38109: Updated Emacs to HEAD, consistently not scaling now

[Alan Third]

On Sun, Nov 17, 2019 at 07:49:56PM +0100, Adam Sjøgren wrote:
> Adam writes:
> 
> >> New patch attached.
> >
> > After a while with this patch running Gnus, Emacs crashed like this:
> 
> Here is a backtrace running Emacs with gdb (I don't really know how to
> use gdb, just "run" and "bt"):

Thanks for trying. I’m giving up on freeing the Pictures there,
although I strongly suspect it’s adding a memory leak.

New patch attached which should resize xpms and xbms. I noticed two problems:

  1. sometimes shrinking an image leaves some pixels behind in clear
  areas.
  
  2. In image mode if I shrink an image enough so that it disappears
  from view completely I can’t then scale it up with +. I suspect
  something’s going to zero and subsequent calculations all stay at
  zero.

-- 
Alan Third

v3-0001-Fix-image-scaling-with-masks-bug-38109.patch
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