Hiltjo Posthuma 44a50ad948 load slide image on-demand ...

previously an image file would be opened but only ffread when advancing to
the slide, but when the slide was not used it gave an error:

	/usr/local/bin/2ff: failed to convert image/png

this changes it to load the image on-demand once and "cache" it.

2016-06-04 17:26:50 +02:00

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