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

[Adam Sjøgren]

Alan writes:

> I want to go back and add a couple of comments to it, so it’s not
> final, but can you please test it and see if you can break it.

.png is scaling for me with your patch:

Nice!

> XPMs are still not scaling. I suspect PBMs are in the same boat. It
> looks like the code for them creates the pixmaps themselves instead of
> using image_create_x_image_and_pixmap, so they bypass the whole
> XRender Picture creation. It should be relatively easy to just add in
> the creation of a Picture.

👍