GNU bug report logs - #72870
[PATCH] Flow fill texts after the last hard newline

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From: Pengji Zhang <me <at> pengjiz.com>
To: 72870 <at> debbugs.gnu.org
Subject: bug#72870: [PATCH] Flow fill texts after the last hard newline
Date: Thu, 29 Aug 2024 18:44:36 +0800

[Message part 1 (text/plain, inline)]

Tags: patch  Hello!

I found that function `fill-flowed-encode' would not fill texts 
after the last hard newline in a buffer. To reproduce, run 'emacs 
-Q' and then evaluate the following snippet:

--8<---------------cut here---------------start------------->8---
(with-current-buffer (get-buffer-create "*tmp-f=f*")
 (use-hard-newlines)
 (insert "1\n2")
 (fill-flowed-encode)
 (display-buffer (current-buffer)))
--8<---------------cut here---------------end--------------->8---

The expected output should be '1 2', but the actual is '1\n2'.

The first patch changes this.

[0001-Flow-fill-texts-after-the-last-hard-newline.patch (text/patch, attachment)]

[Message part 3 (text/plain, inline)]

Besides, I found that the test case 
'fill-flow-tests-fill-flowed-encode' in 'fill-flow-tests' does not 
actually test the function 'fill-flowed-encode', which requires 
'use-hard-newlines'[1], and the test input does not cover some 
behaviors of the function. The second patch improves it a bit.

[0002-Improve-tests-for-flow-fill.patch (text/x-patch, attachment)]

[Message part 5 (text/plain, inline)]

The second patch depends on the first one, without which the new 
test will fail. So I decided to submit both together. Please let 
me know if it is better to file another report.

Thanks!

Cheers,
Pengji

PS I have sent an email to assign <at> gnu.org, but have not got a 
response yet. I think I have not finished the copyright assignment 
process?

[1] https://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/mail/flow-fill.el#n77

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