Re: 23.0.50; Display bug with vline.el and viper

[Lennart Borgman (gmail)]

Vinicius Jose Latorre wrote:
> > > Could it be a bug in vline mode?  What does vline mode do, anyway?
> >
> > Drew answered what it does.
> >
> > I do not think it is a bug in vline. The code that updates the display 
> > in vline-show is in a save-excursion form so point should be restored.
>
> I had a similar problem in highline package.
>
> Try to insert:
>
>    (redisplay t)
>
> At the end of vline-show function.

It did not cure the problem, but changed the behaviour a bit (when I 
added it at the beginning of the function, after vline-clear has been 
run). I think this might be a redisplay problem.

I tried to narrow it down a bit more. It happens when there is something 
like this

  a line that wraps
  empty line
  non-empty line

Try this with

  - screen height 3
  - viper-mode on
  - vline-mode on
  - point in column 1

Just press the up and down keys repeatedly. (Turn on viper-mode with 
viper-mode and turn it off with viper-go-away.)

It looks very weird that viper-mode is involved. There are viper 
functions in pre/post-command-hook, but AFAICS they does nothing here. 
(Am I missing something, Michael?)

Is there no one else that can reproduce this? Is it perhaps a w32 only 
problem?