Thunderbird has no icon displayed in GNOME Software and has possibly other problems because its AppStream metadata id does not match the desktop file name.

Ideally, the desktop file should be renamed to "net.thunderbird.Thunderbird.desktop".

The appdata file should also be renamed to "net.thunderbird.Thunderbird.appdata.xml" because it should also match the AppStream app id.

For example, see the Firefox package (F40 and Rawhide).

There is another possible solution of just adding "<launchable type="desktop-id">mozilla-thunderbird.desktop</launchable>" to the thunderbird.appdata.xml file and not changing anything else. But that is not a clean solution, only a workaround.

Reproducible: Always

Steps to Reproduce:
1. Open the "Software" app.
2. Search for "thunderbird".
3. See the rpm result page.

Actual Results:  
There is no icon displayed.

Expected Results:  
The Thunderbird details page has correct icon.