Update Graph2d.js (almende#3738)

Changes were made to TimeLine.js that need to be in Graph2d.js also. This change fixes zoom/panning issues in Graph2d.

lib/timeline/Graph2d.js

@@ -115,7 +115,40 @@ function Graph2d (container, items, groups, options) {
   this.dom.root.oncontextmenu = function (event) {
     me.emit('contextmenu', me.getEventProperties(event))
   };
+
+  //Single time autoscale/fit
+  this.initialFitDone = false;
+  this.on('changed', function (){
+    if (me.itemsData == null) return;
+    if (!me.initialFitDone && !me.options.rollingMode) {
+      me.initialFitDone = true;
+      if (me.options.start != undefined || me.options.end != undefined) {
+        if (me.options.start == undefined || me.options.end == undefined) {
+          var range = me.getItemRange();
+        }
+
+        var start = me.options.start != undefined ? me.options.start : range.min;
+        var end   = me.options.end   != undefined ? me.options.end   : range.max;
+        me.setWindow(start, end, {animation: false});
+      } else {
+        me.fit({animation: false});
+      }
+    }
 
+    if (!me.initialDrawDone && (me.initialRangeChangeDone || (!me.options.start && !me.options.end) 
+      || me.options.rollingMode)) {
+      me.initialDrawDone = true;
+      me.itemSet.initialDrawDone = true;
+      me.dom.root.style.visibility = 'visible';
+      me.dom.loadingScreen.parentNode.removeChild(me.dom.loadingScreen);
+      if (me.options.onInitialDrawComplete) {
+        setTimeout(() => {
+          return me.options.onInitialDrawComplete();
+        }, 0)
+      }
+    }
+  });
+
   // apply options
   if (options) {
     this.setOptions(options);