Prevent excessive call to save_tree_state

issue3784
review4611003

tryton/gui/window/view_form/view/form_gtk/many2many.py

@@ -246,7 +246,6 @@ class Many2Many(WidgetInterface):
         return True
 
     def set_value(self, record, field):
-        self.screen.save_tree_state()
         self.screen.current_view.set_value()
         return True
 

tryton/gui/window/view_form/view/form_gtk/one2many.py

@@ -468,7 +468,6 @@ class One2Many(WidgetInterface):
         return True
 
     def set_value(self, record, field):
-        self.screen.save_tree_state()
         self.screen.current_view.set_value()
         if self.screen.modified():  # TODO check if required
             record.modified_fields.setdefault(field.name)