tweaked graph2d based on timeline. Introduced ignoreStacking for items, used in background item type.

lib/timeline/Graph2d.js

@@ -141,13 +141,16 @@ Graph2d.prototype.setItems = function(items) {
   this.itemsData = newDataSet;
   this.linegraph && this.linegraph.setItems(newDataSet);
 
-  if (initialLoad && ('start' in this.options || 'end' in this.options)) {
-    this.fit();
+  if (initialLoad) {
+    if (this.options.start != undefined || this.options.end != undefined) {
+      var start = this.options.start != undefined ? this.options.start : null;
+      var end   = this.options.end != undefined   ? this.options.end : null;
 
-    var start = ('start' in this.options) ? util.convert(this.options.start, 'Date') : null;
-    var end   = ('end' in this.options)   ? util.convert(this.options.end, 'Date') : null;
-
-    this.setWindow(start, end);
+      this.setWindow(start, end, {animate: false});
+    }
+    else {
+      this.fit({animate: false});
+    }
   }
 };
 

lib/timeline/Stack.js

@@ -59,7 +59,7 @@ exports.stack = function(items, margin, force) {
         var collidingItem = null;
         for (var j = 0, jj = items.length; j < jj; j++) {
           var other = items[j];
-          if (other.top !== null && other !== item && exports.collision(item, other, margin.item)) {
+          if (other.top !== null && other !== item && other.ignoreStacking == false && exports.collision(item, other, margin.item)) {
             collidingItem = other;
             break;
           }

lib/timeline/Timeline.js

@@ -144,6 +144,7 @@ Timeline.prototype.setItems = function(items) {
   // set items
   this.itemsData = newDataSet;
   this.itemSet && this.itemSet.setItems(newDataSet);
+
   if (initialLoad) {
     if (this.options.start != undefined || this.options.end != undefined) {
       var start = this.options.start != undefined ? this.options.start : null;

lib/timeline/component/item/BackgroundItem.js

@@ -31,8 +31,10 @@ function BackgroundItem (data, conversion, options) {
     }
   }
 
-  this.emptyContent = false;
   Item.call(this, data, conversion, options);
+
+  this.ignoreStacking = true; // this is not used when stacking
+  this.emptyContent = false;
 }
 
 BackgroundItem.prototype = new Item (null, null, null);

lib/timeline/component/item/Item.js

@@ -25,6 +25,8 @@ function Item (data, conversion, options) {
   this.left = null;
   this.width = null;
   this.height = null;
+
+  this.ignoreStacking = false;
 }
 
 /**