Sorry for the late reply.
There are 2 things you need to change to achieve that.
1. This is the column output, see that $data['forum_name'] you need to swap it out with the text.
https://github.com/PHPFusion/PHPFusion/blob/Tesseract/infusions/forum_threads_list_panel/forum_threads_list_panel.php#L85
So at the last bit, Lets change
trimlink($data['thread_subject'], 30)."</a><br />n".$data['forum_name']."
to
trimlink($data['thread_subject'], 30)."</a><br />n".$data['first_post_text']."
2. Next, this is the SQL query bit that we need to alter to output a new data column.
https://github.com/PHPFusion/PHPFusion/blob/Tesseract/infusions/forum_threads_list_panel/forum_threads_list_panel.php#L43-L54
Since we need the new first_post_text, we need to redo this query a bit.
Change:
$result = dbquery(
"SELECT f.forum_id, f.forum_cat, f.forum_name, f.forum_description, f.forum_moderators, f.forum_lastpost, f.forum_postcount,
f.forum_threadcount, f.forum_lastuser, f.forum_access, f2.forum_name AS forum_cat_name, f2.forum_description AS forum_cat_description,
t.thread_id, t.thread_lastpost, t.thread_lastpostid, t.thread_subject, t.thread_postcount, t.thread_views, t.thread_lastuser, t.thread_poll,
u.user_id, u.user_name, u.user_status, u.user_avatar
FROM ".DB_FORUMS." f
LEFT JOIN ".DB_FORUMS." f2 ON f.forum_cat = f2.forum_id
LEFT JOIN ".DB_THREADS." t ON f.forum_id = t.forum_id AND f.forum_lastpost=t.thread_lastpost
LEFT JOIN ".DB_USERS." u ON f.forum_lastuser = u.user_id
".(multilang_table("FO") ? "WHERE f2.forum_language='".LANGUAGE."' AND" : "WHERE")." ".groupaccess('f.forum_access')." AND f.forum_cat!='0' AND t.thread_lastpost >= ".$timeframe." AND t.thread_hidden='0'
GROUP BY thread_id ORDER BY t.thread_lastpost LIMIT ".$settings['numofthreads'].""
);
$result = dbquery(
"SELECT f.forum_id, f.forum_cat, f.forum_name, f.forum_description, f.forum_moderators, f.forum_lastpost, f.forum_postcount,
f.forum_threadcount, f.forum_lastuser, f.forum_access, f2.forum_name AS forum_cat_name, f2.forum_description AS forum_cat_description,
t.thread_id, t.thread_lastpost, t.thread_lastpostid, t.thread_subject, t.thread_postcount, t.thread_views, t.thread_lastuser, t.thread_poll,
u.user_id, u.user_name, u.user_status, u.user_avatar,
(SELECT post_message FROM ".DB_POSTS." WHERE thread_id=t.thread_id ORDER BY post_id ASC LIMIT 1) AS first_post_text
FROM ".DB_FORUMS." f
LEFT JOIN ".DB_FORUMS." f2 ON f.forum_cat = f2.forum_id
LEFT JOIN ".DB_THREADS." t ON f.forum_id = t.forum_id AND f.forum_lastpost=t.thread_lastpost
LEFT JOIN ".DB_USERS." u ON f.forum_lastuser = u.user_id
".(multilang_table("FO") ? "WHERE f2.forum_language='".LANGUAGE."' AND" : "WHERE")." ".groupaccess('f.forum_access')." AND f.forum_cat!='0' AND t.thread_lastpost >= ".$timeframe." AND t.thread_hidden='0'
GROUP BY thread_id ORDER BY t.thread_lastpost LIMIT ".$settings['numofthreads'].""
);
Let me know if it works for you. Screenshot of my test for the SQL.
And the text might be very long, so I suggest you to trim it, using trimlink function, or use CSS to line wrap it in 1 line.
As forum text might contain bbcode, you might want to use the parseubb function.
