From lessons learnt from porting moonlight's Grid tests. Instead of
making a child invalidate its parents directly, send a message from the
child to the parent when its DesiredSize changes. LayoutManager also
needed rewriting to allow this.
Usually controls are only registered with their name scope when they get
added to a rooted visual tree, but this causes problems for tests, and
would mean the templated control wouldn't work if the client called
ApplyTemplate themselves before the control is added to the visual tree.
Work around this by explicitly registering template controls with the
name scope when the template is applied.
To allow this, we need to allow controls to be registered with a name
scope multiple times.
Some tests still failing as controls are only registered with name scope
when attached to a rooted visual tree. Need to work around this by
explicitly registering controls when applying template.
Steven Kirk
Wiesław Šoltés
Wiesław Šoltés
Nikita Tsukanov