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

["Lennart Borgman (gmail)" <lennart.borgman@gmail.com>]

Lennart Borgman (gmail) wrote:
> 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

Eh, forgot to say that cursor should be on the non-empty line and that 
this line should be at the bottom of the screen. The strange cursor move 
happens when down arrow is pressed. Then suddenly point jumps to the 
empty line and no scrolling occurs.

There is no error signaled (on the lisp level).

> 
> 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?
> 
> 
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