closes #5443

package.json

@@ -62,7 +62,7 @@
     "nodebb-plugin-spam-be-gone": "0.4.10",
     "nodebb-rewards-essentials": "0.0.9",
     "nodebb-theme-lavender": "3.0.15",
-    "nodebb-theme-persona": "4.2.3",
+    "nodebb-theme-persona": "4.2.4",
     "nodebb-theme-vanilla": "5.2.0",
     "nodebb-widget-essentials": "2.0.13",
     "nodemailer": "2.6.4",

public/src/client/category.js

@@ -58,12 +58,25 @@ define('forum/category', [
 			});
 		});
 
+		handleScrollToTopicIndex();
+
 		handleIgnoreWatch(cid);
 
 		$(window).trigger('action:topics.loaded', {topics: ajaxify.data.topics});
 		$(window).trigger('action:category.loaded', {cid: ajaxify.data.cid});
 	};
 
+	function handleScrollToTopicIndex() {
+		var parts = window.location.pathname.split('/');
+		var topicIndex = parts[parts.length - 1];
+		if (topicIndex && utils.isNumber(topicIndex)) {
+			topicIndex = Math.max(0, parseInt(topicIndex, 10) - 1);
+			if (topicIndex && window.location.search.indexOf('page=') === -1) {
+				navigator.scrollToElement($('[component="category/topic"][data-index="' + topicIndex + '"]'), true, 0);
+			}
+		}
+	}
+
 	function handleIgnoreWatch(cid) {
 		$('[component="category/watching"], [component="category/ignoring"]').on('click', function () {
 			var $this = $(this);
@@ -104,14 +117,10 @@ define('forum/category', [
 	};
 
 	$(window).on('action:ajaxify.contentLoaded', function (ev, data) {
-		if (ajaxify.data.template.category) {
-			var cid = ajaxify.data.cid;
-			if (!cid) {
-				return;
-			}
+		if (ajaxify.data.template.category && ajaxify.data.cid) {
 
-			var bookmarkIndex = localStorage.getItem('category:' + cid + ':bookmark');
-			var clickedIndex = localStorage.getItem('category:' + cid + ':bookmark:clicked');
+			var bookmarkIndex = localStorage.getItem('category:' + ajaxify.data.cid + ':bookmark');
+			var clickedIndex = localStorage.getItem('category:' + ajaxify.data.cid + ':bookmark:clicked');
 
 			bookmarkIndex = Math.max(0, parseInt(bookmarkIndex, 10) || 0);
 			clickedIndex = Math.max(0, parseInt(clickedIndex, 10) || 0);

public/src/modules/navigator.js

@@ -238,14 +238,17 @@ define('navigator', ['forum/pagination', 'components'], function (pagination, co
 
 	navigator.scrollToPostIndex = function (postIndex, highlight, duration) {
 		var scrollTo = components.get('post', 'index', postIndex);
-		var postHeight = scrollTo.height();
-		var viewportHeight = $(window).height();
-		var navbarHeight = components.get('navbar').height();
+		navigator.scrollToElement(scrollTo, highlight, duration);
+	};
 
+	navigator.scrollToElement = function(scrollTo, highlight, duration) {
 		if (!scrollTo.length) {
 			navigator.scrollActive = false;
 			return;
 		}
+		var postHeight = scrollTo.height();
+		var viewportHeight = $(window).height();
+		var navbarHeight = components.get('navbar').height();
 
 		// Temporarily disable navigator update on scroll
 		$(window).off('scroll', navigator.update);
@@ -290,13 +293,8 @@ define('navigator', ['forum/pagination', 'components'], function (pagination, co
 			}
 		}
 
-		if (components.get('topic').length) {
-			animateScroll();
-		} else {
-			navigator.scrollActive = false;
-		}
+		animateScroll();
 	};
 
-
 	return navigator;
 });

src/controllers/category.js

@@ -69,7 +69,7 @@ categoryController.get = function (req, res, callback) {
 			}
 
 			if (!settings.usePagination) {
-				topicIndex = Math.max(topicIndex - (settings.topicsPerPage - 1), 0);
+				topicIndex = Math.max(0, topicIndex - (Math.ceil(settings.topicsPerPage / 2) - 1));
 			} else if (!req.query.page) {
 				var index = Math.max(parseInt((topicIndex || 0), 10), 0);
 				currentPage = Math.ceil((index + 1) / settings.topicsPerPage);