make "next post" button skip visited posts

files/assets/js/post_navigation.js

@@ -2,11 +2,18 @@ let post_permalinks = sessionStorage.getItem("post_permalinks")
 
 if (post_permalinks) {
 	post_permalinks = post_permalinks.split(', ');
-	const current_index = post_permalinks.indexOf(`'${location.href}'`)
+	let current_index = post_permalinks.indexOf(`'${location.href}'`)
 	if (current_index > -1) {
-		const permalink_after = post_permalinks[current_index+1]
+		let permalink_after = post_permalinks[current_index+1]
 
 		if (permalink_after) {
+			let pid = permalink_after.split('/').slice(-2, -1)[0]
+			while (comments[pid]) {
+				current_index += 1
+				permalink_after = post_permalinks[current_index]
+				pid = permalink_after.split('/').slice(-2, -1)[0]
+			}
+
 			for (const btn of document.getElementsByClassName('post_navigation')) {
 				btn.classList.remove('d-none')
 				btn.href = permalink_after.slice(1, -1)

files/templates/header.html

@@ -256,7 +256,6 @@
 									<i class="fas fa-arrow-right"></i>
 								</a>
 							</li>
-							<script src="{{'js/post_navigation.js' | asset}}"></script>
 						{% endif %}
 
 						{% if v %}

files/templates/post.html

@@ -361,6 +361,7 @@
 
 	<input hidden id="twoattrs-{{p.id}}" class="twoattrs" value="{{p.id}},{{p.comment_count}}">
 	<script defer src="{{'js/new_comments.js' | asset}}"></script>
+	<script defer src="{{'js/post_navigation.js' | asset}}"></script>
 	<script defer src="{{'js/post.js' | asset}}"></script>
 
 	{% if fart and not (v and v.has_badge(128)) %}