fix copy/drag abort.

gtk2_ardour/editor_drag.cc

@@ -1378,7 +1378,10 @@ RegionMoveDrag::aborted (bool movement_occurred)
 	if (_copy) {
 
 		for (list<DraggingView>::const_iterator i = _views.begin(); i != _views.end(); ++i) {
+			list<DraggingView>::const_iterator next = i;
+			++next;
 			delete i->view;
+			i = next;
 		}
 
 		_views.clear ();