currently there is ecore_x_current_time passed, which is the time of the
last event. if this is passed to ecore_x_window_focus_at_time the request can be
ignored because the last event can be in the past. Instead using
ecore_x_window_focus fixes this, because current time is passed, which
means that x is just using this event at the time it is called.
@fix T2948