Without this it's not reliably possible to ask whether a given view is visible
by asking
windowHelper.TopViewInWindow(context.GetWindowName()) == context.GetView()
because there could be transient, invisible contexts after it in the Z order.
I guess it's a bit of a coincidence that this has never been a problem so far.
This begins a big refactor of moving more code out of the Gui struct into contexts, controllers, and helpers. We also move some code into structs in the
gui package purely for the sake of better encapsulation
