Remove attributes which assume only one widget in each region: _left, _top, _bottom,  etc.   Refs #11030 !strict.
Remove attributes which assume only one widget in each region: _left, _top, _bottom,  etc.   Refs #11030 !strict.


git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@23442 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful