Adding Unity to OnlyShowIn allowed values

[Pierre Wieser]

> 
> Sorry I am late to the party here and may be off thread. This was
> discussed back in 2009 with the proposal at that time being
> XDG_CURRENT_DESKTOP.
> 
> The shipping versions of LXDE have been using this to control how the
> menu processor matches OnlyShowIn and NotShowIn. It also uses
> XDG_MENU_PREFIX to control the file lookup on the toplevel
> ${XDG_MENU_PREFIX}applications.xml
> 
> http://lists.freedesktop.org/archives/xdg/2009-August/010940.html

I was not conscious of that thread, and, yes, XDG_CURRENT_DESKTOP is
prefectly fine for me.

But I never have seen this variable in any spec ? Should'n it be written
somewhere ?

Regards
Pierre