docs: def hideEvent(self, event):
          """
          Sets the visible state for this widget.  If it is the first time this
          widget will be visible, the initialized signal will be emitted.
          
          :param      state | <bool>
          """
          super(XView, self).hideEvent(event)
          
          # record the visible state for this widget to be separate of Qt's
          # system to know if this view WILL be visible or not once the 
          # system is done processing.  This will affect how signals are
          # validated as part of the visible slot delegation
          self._visibleState = False
          
          if not self.signalsBlocked():
              self.visibleStateChanged.emit(False)
              QTimer.singleShot(0, self.hidden)