9b562a4e0a
The QGuiApplication::setDesktopFileName() call was changed in [1] but
the desktop file and other files that reference it were not.
As shown by Looking Glass [2] on X11 updating these files is still
not enough for GNOME to associate the process with the desktop file,
a StartupWMClass entry is added to the desktop file to fix this.
[1]
129d5882a7 ("Migrate domain name from freecadweb to freecad (#9352)", 2023-04-24)
[2]
https://blogs.gnome.org/mclasen/2016/11/15/help-my-app-icon-is-missing/