Behaviour change: Pass on all events, inform on window active.

[davesmith00000]

At the moment, some messages don't get passed to the window contents if the window isn't active, but I think this is a mistake.

The idea was to prevent actions being taken on one window, when the user really hit a button on a window above it.

I think what should really happen is that we pass all the events as normal, and then also cascade information about the state of the Window, so that the components can decide what to do.