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bug#35396: 12.1.2; wrong interaction between auto-fill and latex comment

From: gojjoe
Subject: bug#35396: 12.1.2; wrong interaction between auto-fill and latex comments
Date: Tue, 23 Apr 2019 17:14:24 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

Hi all.

– Problematic behaviour: When one is writing text in front of a comment '%' and 
auto-fill automatically inserts a newline, the point is suddenly moved to 
*within* the comment, ie on the right of '%'.

– Expected behaviour: The point in the new line should stay to the left of the 
comment, ie of '%'.

– Example:

1. Activate auto-fill-mode in a tex file where LaTeX mode is active.

2. Set fill-column to some value; here I use 20.

3. Suppose we have a line like this:

123456789% commented

4. Now we'd like to add some more text right before the "%", eg "-1234567890 

Note that "123456789-1234567890" is twenty characters long, so auto-fill should 
automatically insert a newline as we type the space after "0". Expected result:

abc% commented
[with point between 'c' and '%']

Instead we get this:

% abccommented
[with point between 'c' and 'c']

That is, our text has been continued  *within* the comment, which wasn't our 

– Further info:

A. If the text before the comment is *already longer* than auto-fill-column 
when we type the space, and if auto-fill can carry some previous text to the 
new line, then everything works correctly. For example, If we have

123456789% commented

And now we type " 1234567890X abc" (note: space instead of "-") right before the 
"%", we get

1234567890X abc% commented

as desired.

B. The length of the text after "%" seems to be irrelevant for this issue.

Let me know what additional info to provide.


Emacs  : GNU Emacs 26.1 (build 1, i686-w64-mingw32)
 of 2018-05-30
Package: 12.1.2

 AUCTeX-date "2019-02-08"
 window-system 'w32
 LaTeX-version "2e"

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