--- baseline/Sources/Post.php	2011-02-07 16:45:09.000000000 +0000
+++ modified/Sources/Post.php	2024-05-12 23:43:54.000000000 +0000
@@ -1080,24 +1080,40 @@
 		));
 
 	if (!empty($topic))
 		getTopic();
 
 	$context['back_to_topic'] = isset($_REQUEST['goback']) || (isset($_REQUEST['msg']) && !isset($_REQUEST['subject']));
 	$context['show_additional_options'] = !empty($_POST['additional_options']) || !empty($_SESSION['temp_attachments']) || !empty($deleted_attachments);
 
 	$context['is_new_topic'] = empty($topic);
 	$context['is_new_post'] = !isset($_REQUEST['msg']);
 	$context['is_first_post'] = $context['is_new_topic'] || (isset($_REQUEST['msg']) && $_REQUEST['msg'] == $ID_FIRST_MSG);
 
+	// Add a warning against consecutive posts. This logic is placed where it is (near the end of this function) mostly because it expects getTopic() to have already been called (when applicable).
+	if (isset($context['previous_posts']) && count($context['previous_posts']) > 0)
+	{
+		$previous_post = $context['previous_posts'][0];
+		$is_consecutive_post = $context['is_new_post'] && $previous_post['poster'] == $context['user']['name'];
+		$is_previous_post_recent = time() - $previous_post['timestamp'] < 86400;
+		$no_serious_error = empty($context['error_type']) || $context['error_type'] != 'serious';
+
+		if ($is_consecutive_post && $is_previous_post_recent && $no_serious_error)
+		{
+			$edit_post_url = $scripturl . '?action=post;msg=' . $previous_post['id'] . ';topic=' . $topic . '.0;sesc=' . $sc;
+			$context['post_error']['messages'][] = sprintf($txt['error_consecutive_post'], $edit_post_url);
+			$context['error_type'] = 'minor';
+		}
+	}
+
 	// Register this form in the session variables.
 	checkSubmitOnce('register');
 
 	// Finally, load the template.
 	if (WIRELESS)
 		$context['sub_template'] = WIRELESS_PROTOCOL . '_post';
 	elseif (!isset($_REQUEST['xml']))
 		loadTemplate('Post');
 }
 
 function Post2()
 {

--- baseline/Themes/default/languages/Post.english.php	2011-02-07 16:45:09.000000000 +0000
+++ modified/Themes/default/languages/Post.english.php	2024-05-12 23:47:12.000000000 +0000
@@ -148,10 +148,11 @@
 $txt['error_new_reply'] = 'Warning - while you were typing a new reply has been posted. You may wish to review your post.';
 $txt['error_new_replies'] = 'Warning - while you were typing %d new replies have been posted. You may wish to review your post.';
 $txt['error_new_reply_reading'] = 'Warning - while you were reading a new reply has been posted. You may wish to review your post.';
 $txt['error_new_replies_reading'] = 'Warning - while you were reading %d new replies have been posted. You may wish to review your post.';
 $txt['error_old_topic'] = 'Warning: this topic has not been posted in for at least ' . $modSettings['oldTopicDays'] . ' days.<br />Unless you\'re sure you want to reply, please consider starting a new topic.';
+$txt['error_consecutive_post'] = 'Warning: a recent post of yours is already the latest one in this topic.<br />Unless you\'re sure that a new post is necessary, please <a href="%s">add to your recent post</a> instead.';
 
 // Use numeric entities in the below sixteen strings.
 $txt['notification_reply_subject'] = 'Topic reply: %s';
 $txt['notification_reply'] = 'A reply has been posted to a topic you are watching by %s.' . "\n\n" . 'View the reply at: ';
 $txt['notification_sticky_subject'] = 'Topic stickied: %s';