Add image viewing widget
@hadess
Submitted by Bastien Nocera Link to original bug (#726490)
Description
There are a number of image viewing widgets in various GNOME applications, each with their own quirks.
It would be useful for GTK+ to have a stock widget to display images that would:
- load remote images asynchronously
- handle zoom levels (best fit, 1:1 zoom)
- handle touch gestures to zoom/unzoom/scroll
- is subclassable to implement things like cropping
Version: 3.91.x