Htmlize's commit bf759aa3b2c4 ("Fix ensuring that the buffer is
fontified") broke line number formatting in ox-html.
You can find two screenshots attached to this e-mail that show the
issue:
- before_bf759aa3b2c4.png: rendered HTML before bf759aa3b2c4.
- after_bf759aa3b2c4.png: rendered HTML after bf759aa3b2c4.
ox-html calls `font-lock-ensure' and then removes formatting on newline
characters by setting the face property to nil, so lines can be
formatted independently (i.e. '<span>' tags are closed on the same
line).
However, after bf759aa3b2c4, the function `htmlize-buffer-1' calls
`font-lock-ensure', which removes the generated nil faces.
For instance, let's say we have the following code block:
#+begin_src emacs-lisp -n
;; Comment.
(message "one")
(message "two")
#+end_src
Just before `htmlize-buffer-1' calls `font-lock-ensure', (buffer-string)
returns:
#(";; Comment.\n(message \"one\")\n(message \"two\")"
0 3 (face font-lock-comment-delimiter-face)
3 11 (face font-lock-comment-face)
11 12 (face nil)
21 26 (face font-lock-string-face)
27 28 (face nil)
37 42 (face font-lock-string-face))
After the call, (buffer-string) returns:
#(";; Comment.\n(message \"one\")\n(message \"two\")"
0 3 (face font-lock-comment-delimiter-face)
3 12 (face font-lock-comment-face)
21 26 (face font-lock-string-face)
37 42 (face font-lock-string-face))
Thus, the generated html code contains interleaved span tags:
<pre class="src src-emacs-lisp"><code><span class="linenr">1: </span><span
style="color: #b22222;">;; </span><span style="color: #b22222;">Comment.
<span class="linenr">2: </span></span>(message <span style="color:
#8b2252;">"one"</span>)
<span class="linenr">3: </span>(message <span style="color:
#8b2252;">"two"</span>)
</code></pre>
System information:
Emacs : GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.51,
cairo version 1.18.4)
of 2026-03-30
Package: Org mode version 10.0-pre (release_9.8-79-gc1b424 @
/home/user/src/org-mode/lisp/)
Roi
