You just use $line(Window,0) to get the number of lines. Set that to a variable, then set a timer to check and see if that number has changed.
While I admit it might be handy to have, the other thread mentioned shows some pretty good reasons not to do such a thing.
Edit: Actually, the above won't work if you're at the buffer limit. You could still set the last line to a variable (with a timestamp if need be) and then set up a timer that compares it to the last line in the buffer. Slightly more complex, but it gets the job done.
Last edited by Thrull; 18/06/11 06:25 AM.