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Make background previews and special file icons less blurry when UI scale factor != 1

Brian Tarricone requested to merge kelnos/xfdesktop:fix-settings-images-rendering-scaled-ui into master

The blurriness fix for the background previews is a bit of a hack, because GtkIconView doesn't appear to allow us to handle different scale factors properly when providing GdkPixbuf instances.

GtkIconView also requires the pixbuf column to be a GdkPixbuf, but to handle the scale factor correctly I believe we need to use a cairo_surface_t instead. So we give GtkIconView its GdkPixbuf column, but also give it a cairo_surface_t column, and then overwrite the settings on its GtkCellRendererPixbuf to use the surface instead of the pixbuf.

Hopefully this doesn't break in weird ways with new GTK versions.

Closes #56 (closed)

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