This bug was fixed in the package metacity - 1:3.12.0-1ubuntu4
--------------- metacity (1:3.12.0-1ubuntu4) utopic; urgency=medium
* Ignore adding a window if it is already present (LP: #1374927). -- Dmitry Shachnev <email address hidden> Wed, 01 Oct 2014 21:04:43 +0400
This bug was fixed in the package metacity - 1:3.12.0-1ubuntu4
---------------
metacity (1:3.12.0-1ubuntu4) utopic; urgency=medium
* Ignore adding a window if it is already present (LP: #1374927).
-- Dmitry Shachnev <email address hidden> Wed, 01 Oct 2014 21:04:43 +0400