void Layout::create_constraint(Widget &src, ConstraintType type, Widget &tgt, int sp)
{
if(&src==&tgt)
- throw invalid_argument("&src==&tgt");
+ throw invalid_argument("Layout::create_constraint");
Slot &src_slot = get_slot_for_widget(src);
Slot &tgt_slot = get_slot_for_widget(tgt);