BUG)	Dragging the image with Control held down, or using the middle button, shall scroll the display area

BUG)	It shall be possible to drag and drop (started without any modifier) the image
	(the file itself is being dragged, not a copy of the image) to another application.

LATER)	Optional (opt-in) side-pane ("_Property pane") with image properties (accelerator: F9)
LATER)	Optional (opt-in) bottom-pane ("Image _collection") with image thumbnails (accelerator: Control+F9)
		The bottom-pane shall support:
		*	drag and drop to reorder
		*	drag to another application to drop the file by path there
		*	drop form another application to add the image to the collection
		*	right-clicking on a thumbnail and "_Remove from collection" (icon: edit-delete)

LATER)	Automatically go to next picture
LATER)	What file types shall be supported
LATER)	Animation support
LATER)	Preferences for transparency
LATER)	Preferences for changling GDK_INTERP_BILINEAR
LATER)	Fix "GFileInfo created without standard::is-hidden" error message
LATER)	Fix "GFileInfo created without standard::is-backup" error message
LATER)	Add support for farbfeld
LATER)	Add support for lss16
LATER)	Add support for pam (portable anymap)