* src/DisplayTabs.py: use idle_loop to load data for source

backreferences
* src/EditSource.py: close the BackReferences tab to turn off the
idle loop if still active
* src/GrampsDb/_GrampsBSDDB.py: close secondary indexes before primary


svn: r5829

gramps2/src/GrampsDb/_GrampsBSDDB.py

@@ -783,14 +783,6 @@ class GrampsBSDDB(GrampsDbBase):
         if not self.db_is_open:
             return
         self.name_group.close()
-        self.person_map.close()
-        self.family_map.close()
-        self.repository_map.close()
-        self.place_map.close()
-        self.source_map.close()
-        self.media_map.close()
-        self.event_map.close()
-        self.reference_map.close()
         if not self.readonly:
             self.metadata['bookmarks'] = self.bookmarks
             self.metadata['gender_stats'] = self.genderStats.save_stats()
@@ -811,6 +803,17 @@ class GrampsBSDDB(GrampsDbBase):
         self.pid_trans.close()
         self.reference_map_primary_map.close()
         self.reference_map_referenced_map.close()
+        self.reference_map.close()
+
+        # primary databases must be closed after secondary indexes, or
+        # we run into problems with any active cursors.
+        self.person_map.close()
+        self.family_map.close()
+        self.repository_map.close()
+        self.place_map.close()
+        self.source_map.close()
+        self.media_map.close()
+        self.event_map.close()
         self.env.txn_checkpoint()
         self.env.close()