Custom QToolTip.showText closes immediately

Question

I'd like to display a tooltip when somebody selects an item from QComboBox.

My code is as follows:

   def on_tooltip():
      QToolTip.showText(
         self._w.combo.mapToGlobal( QtCore.QPoint( 0, 0 ) ),
         'my tooltip text',
         w = self.w.combo,
         msecShowTime=3000)


   self.w.combo.activated.connect(on_tooltip)

msecShowTime is totally ignored - as soon as the tooltip is displayed, it is closed immediately. It doesn't matter if a pass the w argument.

I am using PySide6 (6.4.0.1) on Windows platform.

Thanks!

I was also trying to replace activated signal with overriding the mouseMoveEvent and enabling setMouseTracking (my widget is created using Qt Designer, so I cannot override my QComboBox object). But I am not receiving any events this way.