code: func (t *TermHandlers) HandleWinChange(ch ssh.Channel, req *ssh.Request, ctx *ServerContext) error {
  	params, err := parseWinChange(req)
  	if err != nil {
  		return trace.Wrap(err)
  	}
  
  	// Update any other members in the party that the window size has changed
  	// and to update their terminal windows accordingly.
  	err = t.SessionRegistry.NotifyWinChange(*params, ctx)
  	if err != nil {
  		return trace.Wrap(err)
  	}
  
  	return nil
  }
docs: // HandleWinChange handles requests of type "window-change" which update the
  // size of the PTY running on the server and update any other members in the
  // party.