Merge branch 'develop' of https://github.com/almende/vis into develop

lib/network/CachedImage.js

@@ -23,6 +23,7 @@ class CachedImage {
   init() {
     if (this.initialized()) return;
 
+    this.src = this.image.src;  // For same interface with Image
     var w = this.image.width;
     var h = this.image.height;
 

lib/network/modules/components/nodes/shapes/Image.js

@@ -10,6 +10,17 @@ class Image extends CircleImageBase {
   }
 
   resize(ctx, selected = this.selected, hover = this.hover) {
+    var imageAbsent = (this.imageObj.src === undefined) ||
+        (this.imageObj.width === undefined) ||
+        (this.imageObj.height === undefined);
+
+    if (imageAbsent) {
+      var side = this.options.size * 2;
+      this.width = side;
+      this.height = side;
+      return;
+    }
+
     if (this.needsRefresh(selected, hover)) {
       this._resizeImage();
     }

lib/timeline/component/ItemSet.js

@@ -634,9 +634,14 @@ ItemSet.prototype.redraw = function() {
   var visibleInterval = range.end - range.start;
   var zoomed = (visibleInterval != this.lastVisibleInterval) || (this.props.width != this.props.lastWidth);
   var scrolled = range.start != this.lastRangeStart;
-  var forceRestack = (zoomed || scrolled);
+  var changedStackOption = options.stack != this.lastStack
+  var changedStackSubgroupsOption = options.stackSubgroups != this.lastStackSubgroups
+  var forceRestack = (zoomed || scrolled || changedStackOption || changedStackSubgroupsOption);
   this.lastVisibleInterval = visibleInterval;
   this.lastRangeStart = range.start;
+  this.lastStack = options.stack;
+  this.lastStackSubgroups = options.stackSubgroups;
+
   this.props.lastWidth = this.props.width;
 
   var firstGroup = this._firstGroup();