Make sure tooltips are shown properly in popups.

The problem was that if you had child widgets of a popup, only child
widgets that had hasMouseTracking() == true received the ToolTip
event.  This was because in order for a widget to receive a ToolTip,
it relied on the MouseMove event.
It still relies on the MouseMove event, but the problem with the
previous code was that it did not even *try* to deliver the MouseMove
event to the widget that did not have mousetracking. And it was
the code that "tried" to deliver (QApplication::notify()) the event
that also was responsible of finding which widget it should get the
tooltip from. Unfortunately the previous code did not even enter
QApplication::notify() because of that early cut-off.
The result was that the event was propagated up to the parent widget
(which was the popup) and consumed by the popup. (Nothing would happen
unless the popup itself had a tooltip). This is also how
translateMouseEvent() is implemented in qapplication_x11.cpp.

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