Merge branch 'develop' into network_performance_pullrequest

lib/timeline/component/ItemSet.js

@@ -546,7 +546,7 @@ ItemSet.prototype.getVisibleItems = function() {
   for (var groupId in this.groups) {
     if (this.groups.hasOwnProperty(groupId)) {
       var group = this.groups[groupId];
-      var rawVisibleItems = group.visibleItems;
+      var rawVisibleItems = group.isVisible ? group.visibleItems : [];
 
       // filter the "raw" set with visibleItems into a set which is really
       // visible by pixels

misc/we_need_help.md

@@ -16,3 +16,4 @@ If you have shown some commitment to the project you can ask [@ludost](//github.
 * [@Tooa](//github.com/Tooa)
 * [@eymiha](//github.com/eymiha)
 * [@bradh](//github.com/bradh)
+* [@wimrijnders](//github.com/wimrijnders)