catchup in category view mode jumps to the next unread category

feedlist.js

@@ -135,22 +135,41 @@ function viewfeed(feed, subop, is_cat, subop_param, skip_history, offset) {
 
 		if (subop == "MarkAllRead") {
 
-			var feedlist = document.getElementById('feedList');
-			
-			var next_unread_feed = getRelativeFeedId(feedlist,
-					feed, "next", true);
-
-			if (!next_unread_feed) {
-				next_unread_feed = getRelativeFeedId(feedlist,
-					-3, "next", true);
-			}
-
 			var show_next_feed = getInitParam("on_catchup_show_next_feed") == "1";
 
-			if (next_unread_feed && show_next_feed && !activeFeedIsCat()) {
-				query = query + "&nuf=" + param_escape(next_unread_feed);
-				//setActiveFeedId(next_unread_feed);
-				feed = next_unread_feed;
+			if (show_next_feed) {
+
+				if (!activeFeedIsCat()) {
+	
+					var feedlist = document.getElementById('feedList');
+				
+					var next_unread_feed = getRelativeFeedId(feedlist,
+							feed, "next", true);
+	
+					if (!next_unread_feed) {
+						next_unread_feed = getRelativeFeedId(feedlist,
+							-3, "next", true);
+					}
+		
+					if (next_unread_feed) {
+						query = query + "&nuf=" + param_escape(next_unread_feed);
+						//setActiveFeedId(next_unread_feed);
+						feed = next_unread_feed;
+					}
+				} else {
+	
+					var next_unread_feed = getNextUnreadCat(feed);
+
+					/* we don't need to specify that our next feed is actually
+					a category, because we're in the is_cat mode by definition
+					already */
+
+					if (next_unread_feed && show_next_feed) {
+						query = query + "&nuf=" + param_escape(next_unread_feed);
+						feed = next_unread_feed;
+					}
+
+				}
 			}
 		}
 

functions.js

@@ -1035,6 +1035,40 @@ function toggleSelectRow(sender) {
 	}
 }
 
+function getNextUnreadCat(id) {
+	try {
+		var rows = document.getElementById("feedList").getElementsByTagName("LI");
+		var feeds = new Array();
+
+		var unread_only = true;
+		var is_cat = true;
+
+		for (var i = 0; i < rows.length; i++) {
+			if (rows[i].id.match("FCAT-")) {
+				if (rows[i].id == "FCAT-" + id && is_cat || (Element.visible(rows[i]) && Element.visible(rows[i].parentNode))) {
+
+					var cat_id = parseInt(rows[i].id.replace("FCAT-", ""));
+
+					if (cat_id >= 0) {
+						if (!unread_only || get_cat_unread(cat_id) > 0) {
+							feeds.push(cat_id);
+						}
+					}
+				}
+			}
+		}
+
+		var idx = feeds.indexOf(id);
+		if (idx != -1 && idx < feeds.length) {
+			return feeds[idx+1];					
+		} else {
+			return feeds.shift();
+		}
+
+	} catch (e) {
+		exception_error("getNextUnreadCat", e);
+	}
+}
 
 function getRelativeFeedId2(id, is_cat, direction, unread_only) {	
 	try {

viewfeed.js

@@ -81,7 +81,7 @@ function headlines_callback2(transport, active_feed_id, is_cat, feed_cur_page) {
 		if (is_cat != undefined) {
 			active_feed_is_cat = is_cat;
 		}
-	
+
 		if (!is_cat) {
 			var feedr = document.getElementById("FEEDR-" + active_feed_id);
 			if (feedr && !feedr.className.match("Selected")) {