Selection listeners are now notified when new dimensions are added (because

this implies that an empty selection is made on the new dimension).

fluents/project.py

@@ -47,10 +47,9 @@ class Project:
         
     def set_selection(self, dim_name, selection):
         """Sets a current selection and notify observers"""
-        if self._last_selection != selection: 
-            self.sel_obj[dim_name] = set(selection)
-            self.notify_selection_listeners(dim_name)
-            self._last_selection = selection
+        self.sel_obj[dim_name] = set(selection)
+        self.notify_selection_listeners(dim_name)
+        self._last_selection = selection
 
     def get_selection(self):
         """Returns the current selection object"""
@@ -117,6 +116,7 @@ class Project:
             if dim_name not in self.dim_names:
                 self.dim_names.append(dim_name)
                 self.sel_obj[dim_name] = set()
+                self.notify_selection_listeners(dim_name)
         self.notify_dataset_listeners()
 
     def add_selection(self, selection):

fluents/selections.py

@@ -193,6 +193,7 @@ class SelectionListController:
 
     def selection_changed(self, dimname, selection):
         """Callback function from Project."""
+        print "selection changed"
         for dim in selection.dims():
             self._ensure_selection_store(dim)
             store = self._sel_stores[dim]