LT-127: Enable to scroll fluidly through images in FF and IE (WIP)

Packages/viewerbase/lib/setActiveViewport.js

@@ -19,5 +19,7 @@ setActiveViewport = function(element) {
     displayReferenceLines(element);
 
     // Set the div to focused, so keypress events are handled
-    $(element).focus();
+    //$(element).focus();
+    //.focus() event breaks in FF&IE
+    $(element).triggerHandler("focus");
 };