closes #3742

public/less/generics.less

@@ -9,7 +9,7 @@
 		.border-radius(3px);
 
 		&.disabled {
-			-webkit-filter: grayscale(30%);
+			background-color: #888!important;
 			.opacity(0.5);
 		}
 	}

public/src/admin/manage/category.js

@@ -240,7 +240,7 @@ define('admin/manage/category', [
 			}
 
 			categories = categories.filter(function(category) {
-				return category && parseInt(category.cid, 10) !== parseInt(ajaxify.data.category.cid, 10);
+				return category && !category.disabled && parseInt(category.cid, 10) !== parseInt(ajaxify.data.category.cid, 10);
 			});
 
 			templates.parse('partials/category_list', {

src/socket.io/categories.js

@@ -15,7 +15,25 @@ SocketCategories.getRecentReplies = function(socket, cid, callback) {
 };
 
 SocketCategories.get = function(socket, data, callback) {
-	categories.getCategoriesByPrivilege('categories:cid', socket.uid, 'find', callback);
+	async.parallel({
+		isAdmin: async.apply(user.isAdministrator, socket.uid),
+		categories: function(next) {
+			async.waterfall([
+				async.apply(db.getSortedSetRange, 'categories:cid', 0, -1),
+				async.apply(categories.getCategoriesData),
+			], next);
+		}
+	}, function(err, results) {
+		if (err) {
+			return callback(err);
+		}
+
+		results.categories = results.categories.filter(function(category) {
+			return category && (!category.disabled || results.isAdmin);
+		});
+
+		callback(null, results.categories);
+	});
 };
 
 SocketCategories.getWatchedCategories = function(socket, data, callback) {