Index: openacs-4/packages/xowiki/www/resources/chat-common.js
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/www/resources/Attic/chat-common.js,v
diff -u -r1.6 -r1.7
--- openacs-4/packages/xowiki/www/resources/chat-common.js	21 Nov 2018 11:32:06 -0000	1.6
+++ openacs-4/packages/xowiki/www/resources/chat-common.js	22 Nov 2018 09:15:37 -0000	1.7
@@ -13,15 +13,16 @@
     // Full screen trigger
     const triggerFSlink = document.createElement("a");
     triggerFSlink.className = 'xowiki-chat-trigger-fs-link';
-    triggerFSlink.setAttribute("href", "javascript:void(0)");
+    triggerFSlink.setAttribute("href", "#");
 
     // Trigger icon
     var triggerFSoff = '<svg class="xowiki-chat-trigger-fs-pic" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 12 14" preserveAspectRatio="xMidYMin meet"><g stroke-width=".033882"><path d="m4.994 10.008v2.1596l-0.6017-0.602-0.6017-0.601-1.0668 1.068c-0.58675 0.58697-1.0823 1.0672-1.1012 1.0672-0.04453 0-1.5755-1.5315-1.5755-1.576 0-0.0186 0.49551-0.52914 1.1011-1.1345l1.1011-1.1007-0.71966-0.72024-0.71966-0.72024h4.1838z"/><path d="m9.7119 8.5856-0.71966 0.72024 1.0842 1.0838c0.5963 0.59609 1.0842 1.0993 1.0842 1.1182 0 0.01889-0.3507 0.38481-0.77933 0.81314l-0.7791 0.779-1.0758-1.076-1.0759-1.075-0.6182 0.618-0.6182 0.618v-4.3196h2.1089 2.1089z"/><path d="m2.8589 2.4267 1.0838 1.0842 0.60168-0.60099 0.60168-0.60099v2.1258 2.1258h-4.0148l0.6182-0.6182 0.6182-0.6182-1.1602-1.1606-1.1602-1.1606 0.82964-0.83016c0.4563-0.45658 0.84509-0.83016 0.86398-0.83016 0.01888 0 0.52204 0.48787 1.1181 1.0842z"/><path d="m10.331 2.1727 0.82964 0.83016-1.1602 1.1606-1.1602 1.1606 0.6182 0.6182 0.6182 0.6182h-3.9814v-4.3194l0.61862 0.61794 0.61862 0.61794 1.0668-1.0672c0.58675-0.58697 1.0747-1.0672 1.0842-1.0672 0.0096 0 0.39074 0.37357 0.84704 0.83016z"/></g></svg>';
     var triggerFSon = '<svg class="xowiki-chat-trigger-fs-pic" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 12 14" preserveAspectRatio="xMidYMin meet"><path stroke-width=".033882" d="m0.047182 10.94v-2.1595l0.60168 0.60099 0.60168 0.60099 1.0668-1.0672c0.58675-0.58697 1.0823-1.0672 1.1012-1.0672 0.04453 0 1.5755 1.5315 1.5755 1.576 0 0.0186-0.49551 0.52914-1.1011 1.1345l-1.1011 1.1007 0.71966 0.72024 0.71966 0.72024h-4.1838zm7.6153 1.4394 0.71966-0.72024-1.0842-1.0838c-0.5963-0.5956-1.0842-1.0988-1.0842-1.1177 0-0.01889 0.3507-0.38481 0.77933-0.81314l0.77933-0.77878 1.0759 1.0755 1.0759 1.0755 0.6182-0.6182 0.6182-0.6182v4.3198h-4.2182zm-5.3282-6.9032-1.0838-1.0842-0.60168 0.60099-0.60168 0.60099v-4.2516h4.0148l-0.6182 0.6182-0.6182 0.6182 1.1602 1.1606 1.1602 1.1606-0.82964 0.83016c-0.4563 0.45658-0.84509 0.83016-0.86398 0.83016-0.01888 0-0.52204-0.48787-1.1181-1.0842zm4.591 0.25401-0.82964-0.83016 1.1602-1.1606 1.1602-1.1606-0.6182-0.6182-0.6182-0.6182h3.981v4.3194l-0.61862-0.61794-0.61862-0.61794-1.0668 1.0672c-0.58675 0.58697-1.0747 1.0672-1.0842 1.0672-0.0096 0-0.39074-0.37357-0.84704-0.83016z"/></svg>';
     triggerFSlink.innerHTML = triggerFSon;
 
     // Full screen when clicked
-    triggerFSlink.addEventListener("click", function() {
+    triggerFSlink.addEventListener("click", function(event) {
+        event.preventDefault();
         var chat = document.getElementById('xowiki-chat');
         var chatFS = document.getElementById('xowiki-chat-fs');
         if (chat != null) {