- The smallest size image of the default (or, if there is no
default, the first) screenshot is used.
- Remote URLs are not supported by QPixmap, so most will not
load anyway.
- Use *appstream* as key in one of the items for the package-
chooser to load data from the AppStream cache in the system.
- Usable for some applications; for DE-selection not so much.
- Currently unimplemented.