(We may have to rethink some of these issues when the multi-tty patch
is checked in, since one frame might be able to display images and
another might not. But that's for after the release.)
(let ((image-display-supported-p (memq window-system '(x w32 mac))))
(if (and image-display-supported-p
(not (get-text-property (point-min) 'display)))
(image-toggle-display)
I would suggest testing whether the selected frame can display an
image. That will get equivalent results in the current situation
while doing something reasonable for multi-tty.
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