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See https://docs.fedoraproject.org/en-US/packaging-guidelines/#_desktop_files and https://docs.fedoraproject.org/en-US/packaging-guidelines/AppData/ See also bz1275800 https://src.fedoraproject.org/rpms/python-notebook/pull-request/24 and https://github.com/jupyter/notebook/pull/6010 for notebook. Thanks.
https://src.fedoraproject.org/rpms/jupyterlab/pull-request/3
The desktop file works fine. I have no idea how to create the Appdata file and what is the benefit of having them.
The appdata file makes it appear nicely in GNOME Software. See e.g. https://src.fedoraproject.org/rpms/slic3r/blob/rawhide/f/slic3r.appdata.xml (I ma not claiming this is a state of the art appdata file, just an example).
FEDORA-2023-ec3158bfa2 has been submitted as an update to Fedora 39. https://bodhi.fedoraproject.org/updates/FEDORA-2023-ec3158bfa2
FEDORA-2023-ec3158bfa2 has been pushed to the Fedora 39 stable repository. If problem still persists, please make note of it in this bug report.