Added full implementation of __gluestate__ and __setgluestate__ for a…

…pplication

glue_qt/app/application.py

@@ -1445,13 +1445,26 @@ def add_datasets(self, *args, **kwargs):
         return result
 
     def __gluestate__(self, context):
-        state = super(GlueApplication, self).__gluestate__(context)
+        viewers = [list(map(context.id, tab)) for tab in self.viewers]
+        data = self.session.data_collection
+        from glue.main import _loaded_plugins
+        state = dict(session=context.id(self.session), viewers=viewers,
+                    data=context.id(data), plugins=_loaded_plugins)
         state['tab_names'] = self.tab_names
         return state
 
     @classmethod
     def __setgluestate__(cls, rec, context):
+        self = cls(data_collection=context.object(rec['data']))
+        # manually register the newly-created session, which the viewers need
+        context.register_object(rec['session'], self.session)
         self = super(GlueApplication, cls).__setgluestate__(rec, context)
+        for i, tab in enumerate(rec['viewers']):
+            if self.tab(i) is None:
+                self.new_tab()
+            for v in tab:
+                viewer = context.object(v)
+                self.add_widget(viewer, tab=i, hold_position=True)
         if 'tab_names' in rec:
             self.tab_names = rec['tab_names']
         return self