https://bugzilla.redhat.com/show_bug.cgi?id=1519785
--- Comment #12 from Ben Rosser rosser.bjr@gmail.com --- Oh, actually, I missed one thing.
notepadqq appears to have recently gained an appstream metadata file:
https://github.com/notepadqq/notepadqq/blob/master/support_files/notepadqq.a...
You should install this using appstream-util. Take a look at this wiki page for information: https://fedoraproject.org/wiki/Packaging:AppData
This will cause notepadqq to show up in Gnome Software (among other places).