Add Pantheon to "OnlyShowIn" entry in desktop file.

[JaSauders]

Pantheon is a desktop environment based on GTK 3 in use by the elementary OS team. Elementary OS, for what it's worth, is based on Ubuntu 12.04. Pantheon is becoming more popular and packages for it already exist in Arch and openSUSE. Unfortunately, Pantheon's file manager has had some stability issues, so I've installed Nautilus. Like many others, we were confused as to why Nautilus was not showing up in the applications menu. After some digging I found the OnlyShowIn entry in /usr/share/applications/nautilus.desktop and, quite honestly, just commented out the whole thing. Suddenly, Nautilus worked - success!

That said, countless others have looked to install an alternative file manager, such as Nautilus, only to find it doesn't show up. They assume it's not supported and move on to other alternatives. If Pantheon could be added so elementary OS could pick up Nautilus that would be tremendously useful to a lot of users.

Thank you for your consideration!

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.

[Sebastien Bacher (seb128)]

Note that Pantheon is not listed by the freedesktop specification as an official desktop environment value for that key, see http://cgit.freedesktop.org/xdg/xdg-specs/tree/menu/menu-spec.xml#n2153