refactor: wrap around if at end

remove debug log
dont focus input on mobile

public/src/modules/navigator.js

@@ -56,7 +56,9 @@ define('navigator', ['forum/pagination', 'components', 'hooks', 'alerts'], funct
 
 		paginationBlockEl.off('shown.bs.dropdown', '.wrapper').on('shown.bs.dropdown', '.wrapper', function () {
 			setTimeout(async function () {
-				$('.pagination-block input').focus();
+				if (utils.findBootstrapEnvironment() === 'lg') {
+					$('.pagination-block input').focus();
+				}
 				const postCountInTopic = await socket.emit('topics.getPostCountInTopic', ajaxify.data.tid);
 				if (postCountInTopic > 0) {
 					paginationBlockEl.find('#myNextPostBtn').removeAttr('disabled');
@@ -107,10 +109,9 @@ define('navigator', ['forum/pagination', 'components', 'hooks', 'alerts'], funct
 		if (ajaxify.data.template.topic) {
 			let nextIndex = await getNext(index);
 			if (lastNextIndex === nextIndex) { // handles last post in pagination
-				console.log('fail', nextIndex, lastNextIndex);
 				nextIndex = await getNext(nextIndex);
 			}
-			if (nextIndex) {
+			if (nextIndex && index !== nextIndex + 1) {
 				lastNextIndex = nextIndex;
 				$(window).one('action:ajaxify.end', function () {
 					if (paginationBlockEl.find('.dropdown-menu').is(':hidden')) {

src/socket.io/topics.js

@@ -88,13 +88,21 @@ SocketTopics.getMyNextPostIndex = async function (socket, data) {
 		cache.set(cacheKey, pids, 30000);
 		return pids;
 	}
-
+	const postCountInTopic = await db.sortedSetScore(`tid:${data.tid}:posters`, socket.uid);
+	if (postCountInTopic <= 0) {
+		return 0;
+	}
 	const [topicPids, userPidsInCategory] = await Promise.all([
 		getTopicPids(data.index),
 		getUserPids(),
 	]);
 	const userPidsInTopic = _.intersection(topicPids, userPidsInCategory);
 	if (!userPidsInTopic.length) {
+		if (postCountInTopic > 0) {
+			// wrap around to beginning
+			const wrapIndex = await SocketTopics.getMyNextPostIndex(socket, { ...data, index: 1 });
+			return wrapIndex;
+		}
 		return 0;
 	}
 	return await posts.getPidIndex(userPidsInTopic[0], data.tid, data.sort);