initial focus owner within windows not set consistently across platforms

When a window is first activated (given focus by the user), there is no
consistent notion of how a component in the window is assigned the default
focus.

Typically, if there is a component within the window that usually takes
focus (such as a textfield), then that component will get focus (on Solaris),
but this is inconsistent across the platforms.

This is particularly a problem when a program has no obvious focus candidate
(say, just panels or canvases) - on Solaris one is assigned focus, on win32,
none of them get focus.

This makes it very difficult to get keyboard input to a program.