[GD-Windows] IsIconic() vs. trapping window messages

[Brian H. <bri...@py...>]

I've seen two different ways of detecting minimized state.  The first is
the standard trapping of WM_MOVE, WM_SIZE, WM_ACTIVATE, etc. messages.
However, I've seen other code that uses IsIconic(HWND).  The latter
obviously can't provide you the state change detection, but assuming you
don't need to capture a change in state but only need to know if you're
iconic or not, is there any place where IsIconic() will fail?

For example, a game might only need to know if it's active or not, and
whether to render.  Activation can be handled through the usual
suspects, and the render loop could just do:

if ( active && !IsIconic( hwnd ) )
   render();

...instead of all the cruft that normally goes into the WndProc.