'Tell the other side that we will receive more data.  This should not
normally need to be called as it is managed automatically.
@type channel:      subclass of L{SSHChannel}
@type bytesToAdd:   L{int}'

def adjustWindow(self, channel, bytesToAdd):

    if channel.localClosed:
        return
    self.transport.sendPacket(MSG_CHANNEL_WINDOW_ADJUST, struct.pack('>2L', self.channelsToRemoteChannel[channel], bytesToAdd))
    log.msg(('adding    %i    to    %i    in    channel    %i' % (bytesToAdd, channel.localWindowLeft, channel.id)))
    channel.localWindowLeft += bytesToAdd
