Divs contain unnecessary blank lines in Mediawiki output

[rohieb]

Using pandoc 3.8.3:

$ cat test.markdown
Some plain text

::: {.some-class}
Here is a div
:::

Here is some more plain text

$ pandoc-3.8 -t mediawiki test.markdown 
Some plain text
<div class="some-class">

Here is a div


</div>
Here is some more plain text

The output for the div snippet contains one additional blank line after the opening <div>, two additional blank lines before the closing </div>, and no blank line after the closing </div> (even though the Markdown input contained blank lines before and after the div element). While two of those are rather cosmetic, the double blank line inside the div makes MediaWiki generate an additional empty paragraph in the rendered output:

It would be great (also for readability) if the MediaWiki writer could generate this instead, which MediaWiki renders more true to the original Markdown input:

Some plain text

<div class="some-class">
Here is a div
</div>

Here is some more plain text

---

Version Info:

$ pandoc-3.8 --version
pandoc 3.8.3
Features: +server +lua
Scripting engine: Lua 5.4
User data directory: ${HOME}/.local/share/pandoc
Copyright (C) 2006-2025 John MacFarlane. Web:  https://pandoc.org
This is free software; see the source for copying conditions. There is no
warranty, not even for merchantability or fitness for a particular purpose.

Pandoc downloaded from GitHub releases, and running on Debian testing/unstable.

[rohieb]

For the sake of completeness, HTML and Markdown output looks fine in this case. Here's the native output:

$ pandoc-3.8 -t native test.markdown 
[ Para
    [ Str "Some" , Space , Str "plain" , Space , Str "text" ]
, Div
    ( "" , [ "some-class" ] , [] )
    [ Para
        [ Str "Here"
        , Space
        , Str "is"
        , Space
        , Str "a"
        , Space
        , Str "div"
        ]
    ]
, Para
    [ Str "Here"
    , Space
    , Str "is"
    , Space
    , Str "some"
    , Space
    , Str "more"
    , Space
    , Str "plain"
    , Space
    , Str "text"
    ]
]

[rohieb]

In https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/MediaWiki.hs#L89 (function lockToMediaWiki (Div attrs bs)) there are two additional \n\n:

blockToMediaWiki (Div attrs bs) = do
  contents <- blockListToMediaWiki bs
  return $ render Nothing (tagWithAttrs "div" attrs) <> "\n\n" <>
                     contents <> "\n\n" <> "</div>"

I don't know what they do or why they're there, but according to the history they have been there since 2013 (commit 8d441af)