Re: feature/icomplete-vertical

[Gregory Heytings]

> Yes, hence the question is "why".  I suspect it has to do with the way 
> we insert the extra text and by teaking it we may work around this 
> problem.

Do you have pointers where one might try to find the "why"?  xdisp.c?

> We could/should also consider this as a problem in the redisplay, so 
> maybe you should file a bug report for it.

It's a well-known problem, with already several bugs filed.

> In any case, your example shows that it's not a new problem introduced 
> by icomplete-vertical, so fixing it should likely be orthogonal to the 
> addition of icomplete-vertical.

Indeed.  In fact AFAICT so far everyone tries to work-around that 
bug/feature/limitation/... by doing what we were trying to do, which 
amounts (as you wrote) to redoing or approximating what redisplay does.