move saveRangeInitial call in graphWasEmpty block:

- so that restyle calls that update that purge gd.calcdata
  don't update the 'initial' axis ranges.
- save initial range even if gd._context settings are such
  that it won't get used (in case gd._context changes during the
  plot life cycle).

src/plot_api/plot_api.js

@@ -147,20 +147,17 @@ Plotly.plot = function(gd, data, layout, config) {
     }
     else if(graphWasEmpty) makePlotFramework(gd);
 
+    // save initial axis range once per graph
+    if(graphWasEmpty) Plotly.Axes.saveRangeInitial(gd);
+
     var fullLayout = gd._fullLayout;
 
     // prepare the data and find the autorange
 
     // generate calcdata, if we need to
     // to force redoing calcdata, just delete it before calling Plotly.plot
-    var recalc = !gd.calcdata || gd.calcdata.length!==(gd.data||[]).length;
-    if(recalc) {
-        doCalcdata(gd);
-
-        if(gd._context.doubleClick!==false || gd._context.displayModeBar!==false) {
-            Plotly.Axes.saveRangeInitial(gd);
-        }
-    }
+    var recalc = !gd.calcdata || gd.calcdata.length !== (gd.data || []).length;
+    if(recalc) doCalcdata(gd);
 
     // in case it has changed, attach fullData traces to calcdata
     for(var i = 0; i < gd.calcdata.length; i++) {