docs: def mouseDoubleClickEvent(self, event):
          """
          Emits the node double clicked event when a node is double clicked.
          
          :param      event | <QMouseDoubleClickEvent>
          """
          super(XNodeScene, self).mouseDoubleClickEvent(event)
          
          # emit the node double clicked signal
          if event.button() == Qt.LeftButton:
              item = self.itemAt(event.scenePos())
              
              if not item:
                  self.clearSelection()
              else:
                  blocked = self.signalsBlocked()
                  self.blockSignals(True)
                  self.clearSelection()
                  item.setSelected(True)
                  self.blockSignals(blocked)
              
                  if isinstance(item, XNode) and not blocked:
                      self.nodeDoubleClicked.emit(item)
                  elif isinstance(item, XNodeConnection) and not blocked:
                      self.connectionDoubleClicked.emit(item)
                  
                  if not blocked:
                      self.itemDoubleClicked.emit(item)