Qt: Bring a timetooltip on the top on OS/2

This fixes the problem that a timetooltip does not appear on fullscreen
from the second fullscreen state change.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/util/timetooltip.cpp

@@ -142,6 +142,13 @@ void TimeTooltip::setTip( const QPoint& target, const QString& time, const QStri
 void TimeTooltip::show()
 {
     QWidget::setVisible( mInitialized );
+#ifdef Q_WS_PM
+    // Bring a tooltip on the top
+    // Without this, tooltip does not appear on fullscreen
+    // from the second fullscreen state change
+    if( mInitialized )
+        QWidget::raise();
+#endif
 }
 
 void TimeTooltip::paintEvent( QPaintEvent * )