Concrete implementation of a compositor that is responsible for adding and
removing native views from the native view hierarchy based on the virtual
representation within Polyhorn.
Opaque wrapper around a container with two optional layouts attached. If
both are given, the first refers to the container’s layout itself, whereas
the second refers to the container’s content layout. These can be different
when working with scroll views for example, which are essentially treated
as two adjacent nodes in the layout tree.