Closing GEF-based editors results in hang-up.
fixed by ignoring Notification.REMOVING_ADAPTER event in GraphicalEditPartBase.java
(from redmine: issue id 1029, created on 2012-11-08, closed on 2012-11-19)
fixed by ignoring Notification.REMOVING_ADAPTER event in GraphicalEditPartBase.java
(from redmine: issue id 1029, created on 2012-11-08, closed on 2012-11-19)