user32/tests: Add test for SetFocus() (with few todo)(Try 2).

[Sergey Guralnik]

Alexandre Julliard writes:

Not really. If you want to test purely the Wine behavior, then you

shouldn't be waiting for window manager events. If the window manager is

involved then you can't guarantee that a given window will always get
focus.

If your app breaks because the window manager doesn't give it focus at a

certain point, then pretty much the only solution is to change the wm
policy, or use a different wm.

Thanks for explanations.

--
Sergey