internal void RecreateSelectionAdorners()
{
_selAdornerGroup.Shapes.Clear();
_selectedShapes.IntersectWith(_doc.Shapes);
foreach (var shape in _selectedShapes)
shape.AddAdornersTo(_selAdornerGroup.Shapes, shape == _partialSelShape ? SelType.Partial : SelType.Yes, HitTestRadius);
_selAdornerLayer.Invalidate();
}