Re: Native line numbers, final testing

[Alex <agrambot@gmail.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Richard Copley <rcopley@gmail.com>
>> Date: Tue, 4 Jul 2017 17:35:16 +0100
>> Cc: Eli Zaretskii <eliz@gnu.org>, james@jojojames.com, 
>> 	Emacs developers <emacs-devel@gnu.org>
>> 
>> C-d 0 C-b C-n
>> C-d 1 C-b C-n
>> C-d 2 C-p C-p
>> 
>> This is supposed to change the character at point to 0 and the
>> characters in the corresponding column in the next two lines to 1
>> and 2.
>> 
>> I think that's a common use case and it won't work if
>> display-line-numbers is on ...
>
> Does it really not work for you with display-line-numbers on?
>
>> Open xdisp.c and go to line 30, column 30.
>> Type "C-d C-n C-d C-n C-d C-n C-d C-n"
>> The first C-n goes to column 30 on line 31 as expected.
>> The 2nd C-n goes to column 29 on line 31 (expected column 30).
>> The 3rd C-n goes to column 28 on line 31 (expected 30 (or 29?)).
>> The 4th C-n goes to column 27 on line 31.
>
> I cannot reproduce this, I get column 30 all the time, as expected.
>
> Are you running the latest branch?  If so, what are the values of the
> related variables?

Here's an attempt at a relevant macro:

C-n C-d 1
C-p DEL 0
C-b

This replaces the character at point to 0, and the one below it to 1.

Now go into xdisp.c and set display-line-numbers to t:

M-g c 2960
C-17 C-n
C-x e

Notice that it's the previous columns that are changed, and not the
current column.