kRightTop
fCorners[Corner::kRightTop].Trace();
{ return &fCorners[Corner::kRightTop]; }
if (_FindFreeAreaInGroup(group, Corner::kRightTop))
case Corner::kRightTop:
case Corner::kRightTop:
case Corner::kRightTop:
fFreeAreaLeft ? Corner::kRightTop : Corner::kLeftTop,
fFreeAreaTop ? Corner::kRightBottom : Corner::kRightTop,