docs: def updateIsolated( self, force = False ):
          """
          Updates the visible state of nodes based on whether or not they are
          isolated.
          """
          if ( not (self.isolationMode() or force) ):
              return
          
          # make sure all nodes are not being hidden because of isolation
          if ( not self.isolationMode() ):
              for node in self.nodes():
                  node.setIsolateHidden(False)
              return
          
          # make sure all the nodes are visible or hidden based on the selection
          selected_nodes  = self.selectedNodes()
          isolated_nodes  = set(selected_nodes)
          connections     = self.connections()
          for connection in connections:
              in_node  = connection.inputNode()
              out_node = connection.outputNode()
              
              if ( in_node in selected_nodes or out_node in selected_nodes ):
                  isolated_nodes.add(in_node)
                  isolated_nodes.add(out_node)
          
          for node in self.nodes():
              node.setIsolateHidden(not node in isolated_nodes)