put range 0,1 parts separately into GUI relayout calls

so that user apps that listen to relayouts get the same form as before

Author: alexcjohnson

src/plots/cartesian/dragbox.js

@@ -553,7 +553,8 @@ module.exports = function dragBox(gd, plotinfo, x, y, w, h, ns, ew) {
             var axId = activeAxIds[i];
             doTicks(gd, axId, true);
             var ax = getFromId(gd, axId);
-            updates[ax._name + '.range'] = ax.range.slice();
+            updates[ax._name + '.range[0]'] = ax.range[0];
+            updates[ax._name + '.range[1]'] = ax.range[1];
         }
 
         function redrawObjs(objArray, method, shortCircuit) {
@@ -824,7 +825,8 @@ function zoomAxRanges(axList, r0Fraction, r1Fraction, updates, linkedAxes) {
             axi.l2r(axRangeLinear0 + axRangeLinearSpan * r0Fraction),
             axi.l2r(axRangeLinear0 + axRangeLinearSpan * r1Fraction)
         ];
-        updates[axi._name + '.range'] = axi.range.slice();
+        updates[axi._name + '.range[0]'] = axi.range[0];
+        updates[axi._name + '.range[1]'] = axi.range[1];
     }
 
     // zoom linked axes about their centers