Bug#668850: libreoffice: opens windows in wrong session

[Zefram <zefram@fysh.org>]

Additional commentary, as I've just run into this issue.  In my case,
I tried to open multiple libreoffice instances in a single login session
on a single X display, but it's a multi-screen display.  Attempting to
bring up libreoffice instances on different screens doesn't work: the
later invocations just bring up more windows on the screen that contains
the original instance.  This seriously impacts usability.

That's really just the icing on the cake.  libreoffice suffers much of the
annoying behaviour that I previously noted for Iceweasel in Bug#617362.
The second libreoffice invocation terminates immediately instead of
waiting for editing of the second file to be finished.  Selecting "Exit"
or performing X client termination on one window closes both.  (At least
some settings are per-window, though.)

Unlike Iceweasel, libreoffice doesn't seem to even offer an option to
control this behaviour.

-zefram