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Re: Native line numbers, final testing

From: Alex
Subject: Re: Native line numbers, final testing
Date: Tue, 04 Jul 2017 11:50:44 -0600
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> From: Richard Copley <address@hidden>
>> Date: Tue, 4 Jul 2017 17:35:16 +0100
>> Cc: Eli Zaretskii <address@hidden>, address@hidden, 
>>      Emacs developers <address@hidden>
>> 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

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.

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