Fix - correctly update TGraph drawing when X range is changing

While axes drawn with dummy histogram, one should correctly update
histogram for that. There was error with copy of axes settings

Author: linev

scripts/JSRootPainter.hist.js

@@ -2101,14 +2101,14 @@
          function CopyAxis(tgt,src) {
             tgt.fTitle = src.fTitle;
             tgt.fLabels = src.fLabels;
+            tgt.fXmin = src.fXmin;
+            tgt.fXmax = src.fXmax;
          }
          CopyAxis(histo.fXaxis, obj.fXaxis);
          CopyAxis(histo.fYaxis, obj.fYaxis);
          CopyAxis(histo.fZaxis, obj.fZaxis);
          if (!fp.zoom_changed_interactive) {
             function CopyZoom(tgt,src) {
-               tgt.fXmin = src.fXmin;
-               tgt.fXmax = src.fXmax;
                tgt.fFirst = src.fFirst;
                tgt.fLast = src.fLast;
                tgt.fBits = src.fBits;

scripts/JSRootPainter.more.js

@@ -779,7 +779,7 @@
 
    function TGraphPainter(graph) {
       JSROOT.TObjectPainter.call(this, graph);
-      this.ownhisto = false; // indicate if graph histogram was drawn for axes
+      this.axes_draw = false; // indicate if graph histogram was drawn for axes
       this.bins = null;
       this.xmin = this.ymin = this.xmax = this.ymax = 0;
       this.wheel_zoomy = true;
@@ -914,7 +914,7 @@
    }
 
    TGraphPainter.prototype.CreateHistogram = function() {
-      // bins should be created
+      // bins should be created when calling this function
 
       var xmin = this.xmin, xmax = this.xmax, ymin = this.ymin, ymax = this.ymax;
 
@@ -1755,9 +1755,9 @@
       this.CreateBins();
 
       // if our own histogram was used as axis drawing, we need update histogram  as well
-      if (this.ownhisto) {
+      if (this.axes_draw) {
          var main = this.main_painter();
-         if (obj.fHistogram) main.UpdateObject(obj.fHistogram);
+         main.UpdateObject(obj.fHistogram || this.CreateHistogram());
          main.GetObject().fTitle = graph.fTitle; // copy title
       }
 
@@ -1886,7 +1886,7 @@
    }
 
    TGraphPainter.prototype.PerformDrawing = function(divid, hpainter) {
-      if (hpainter) this.ownhisto = true;
+      if (hpainter) this.axes_draw = true;
       this.SetDivId(divid);
       this.DrawBins();
       this.DrawNextFunction(0, this.DrawingReady.bind(this));