Re: master 616da8fa8e: Merge branch 'feature/fix-the-long-lines-display-bug'

[Gregory Heytings]

> I think it would be more useful to explain what the user can (and can 
> not) expect from those "specific optimizations".  Otherwise, it is not 
> possible to make an intelligent decision about the value of that option.

One of the design principles of that feature is that it should be as 
transparent as possible, and it is.  The point of adding a variable to 
control the feature was to avoid introducing an arbitrary constant at the 
C level, and also to allow users who really enjoy slowdowns to turn these 
optimizations off 😉  Its default value should be fine for everyone, there 
is no "intelligent decision" to make here.

> For example, describing that vertical-motion is still slow when point is 
> on a long line would be very helpful.

Vertical-motion is not slow anymore.