bug#47498: 28.0.50; follow-mode misses a line with tiling window manager

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bug#47498: 28.0.50; follow-mode misses a line with tiling window manager

Stefan Kangas
martin rudalics <[hidden email]> writes:

>  > 0. emacs -Q
>  > 1. C-h i
>  > 2. C-x 2
>
> Why C-x 2?  The whole idea of `follow-mode' is based on C-x 3.  Or am I
> missing something?

Sorry, yes, that step should indeed be `C-x 3'.

>  > 3. M-x follow-mode RET
>  >
>  > There is now one line missing from the display.  When using
>  > `display-line-numbers-mode', this effect is more obvious.
>
> Which line?  Can you post a screenshot?

Please see the attached.

bug-47498.png (492K) Download Attachment
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bug#47498: 28.0.50; follow-mode misses a line with tiling window manager

Eli Zaretskii
> From: Stefan Kangas <[hidden email]>
> Date: Tue, 30 Mar 2021 10:36:23 -0500
>
> >  > 3. M-x follow-mode RET
> >  >
> >  > There is now one line missing from the display.  When using
> >  > `display-line-numbers-mode', this effect is more obvious.
> >
> > Which line?  Can you post a screenshot?
>
> Please see the attached.

Probably because there's a header-line, or the bread-crumbs display
property at the top of the window.



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bug#47498: 28.0.50; follow-mode misses a line with tiling window manager

martin rudalics
In reply to this post by Stefan Kangas
 >> Which line?  Can you post a screenshot?
 >
 > Please see the attached.

I see it now here.  Looks like a problem with `pos-visible-in-window-p'
when the frame is maximized.  How these could be related is not clear to
me.

martin



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bug#47498: 28.0.50; follow-mode misses a line with tiling window manager

Stefan Kangas
In reply to this post by Eli Zaretskii
Eli Zaretskii <[hidden email]> writes:

>> From: Stefan Kangas <[hidden email]>
>> Date: Tue, 30 Mar 2021 10:36:23 -0500
>>
>> >  > 3. M-x follow-mode RET
>> >  >
>> >  > There is now one line missing from the display.  When using
>> >  > `display-line-numbers-mode', this effect is more obvious.
>> >
>> > Which line?  Can you post a screenshot?
>>
>> Please see the attached.
>
> Probably because there's a header-line, or the bread-crumbs display
> property at the top of the window.

Yes, something like that.  I can't reproduce this in e.g. `C-h C-n'.