At 3:39 PM +0200 5/8/00, Jan Vroonhof wrote: There is no next line, that's the problem. I did that. It doesn't lay out any lines because the height of the window is less than the height of one line. I don't know enough about the redisplay code to know if this is supposed to be impossible or if it is normal but the redisplay code isn't handling it right. Unfortunately I don't have time to learn how the redisplay code works well enough to debug this. The change I made was intended to be a defensive change against any problems such as this. There may be a deeper problem that needs fixing, but I don't think my change will hurt anything (except perhaps hide the deeper problem). If this bothers people it would be possible to leave the assert in the debug build and take it out in the optimized build. For that matter, I don't really care if it is vetoed, but if so someone should fix the real problem (and I'm probably not the person to do that). Right, I can't recall what I did recently to provoke this but it happened while I was trying to debug the problem with interrupting sub-processes. I needed to do something to get around the problem so I could continue to work on the real problem I was trying to find. I've also seen this assert fire in the past when starting up ediff. Mike