bug#21239: 25.0.50; `(image-size image 'pixels)` is causing Emacs to freeze on OSX Snow Leopard.

[Keith David Bershatsky]

Additional follow-up:

In the older version of Emacs Trunk from last year, the test `(fboundp 
'imagemagick-types)' is `nil'.  In the Emacs Trunk  from August 4, 2015, the 
same test is `t`.

The section of code from `doc-view-insert-image` tests for both 
`doc-view-scale-internally' AND `(fboundp 'imagemagick-types)'.

So, while it seemed that the culprit was `doc-view-scale-internally', it is 
actually how Emacs behaves in `image-mode' and `doc-view-mode' when `(fboundp 
'imagemagick-types)' is `t`.

Setting `imagemagick-types-inhibit' to `t' seems to fixe the problem with 
displaying a raw xpm in `image-mode'` in a buffer all by itself; and, adding an 
additional test to `doc-view-insert-image' of `(not (eq 
imagemagick-types-inhibit t))' is one way to get Emacs to stop freezing.