Add "Development" and "Emulator" categories to the desktop file
Currently, The flathub page of Boxes lacks categories https://flathub.org/apps/details/org.gnome.Boxes
Which by looking at the desktop file https://gitlab.gnome.org/GNOME/gnome-boxes/blob/master/data/org.gnome.Boxes.desktop.in#L13
shows only the basic categories, other categories from the freedesktop standards could be used
https://standards.freedesktop.org/menu-spec/latest/apas02.html
Edited by Felipe Borges