Description Florian Barbin 2018-02-14 07:42:31 EST

+++ This bug was initially created as a clone of Bug #497469 +++

Steps to reproduce: 
. Create/open any modeling project with a semantic model and some representation
. Right clic the aird, clic "Export representations as images" and OK
. The session is closed, there is no decorator or children displayed under the aird and the semantic resources.
. The user needs to close/open or collapse/expand the ModelingProject to reopen it.

Note that if the project does not have the modeling project nature, it is also disturbing, the aird file has no more children as the session has been closed by the action and the user need to double click the aird or use the open menu to reopen the session. 

Looking at the code of org.eclipse.sirius.ui.tools.internal.actions.export.ExportRepresentationsFromFileAction, it looks like we get the current session or open a session on the selected aird (line 68:   Session session = SessionManager.INSTANCE.getSession..)

Then we take all representations and display the directory/imageType dialog and we execute a WorkspaceModifyingOperation in which we call SessionManager.openSession() (line 90) before calling the exportAction. 

After the export, ExportRepresentationsFromFileAction closes the session (line 98). 


There is a !isOpen check which seems to be here to avoid to close the session if it was already open before running the action but it is initalized at false and never updated. 
Before calling SessionManager.openSession line 90, we should get the status of the session created or retrieved line 68.