wip fix #4002

Author: etpinard

src/plots/command.js

@@ -360,9 +360,13 @@ function computeDataBindings(gd, args) {
         traces = null;
     }
 
-    crawl(aobj, function(path, attrName, attr) {
+    crawl(aobj, function(path, attrName, _attr) {
         var thisTraces;
-        if(Array.isArray(attr)) {
+        var attr;
+
+        if(Array.isArray(_attr)) {
+            attr = _attr.slice();
+
             var nAttr = Math.min(attr.length, gd.data.length);
             if(traces) {
                 nAttr = Math.min(nAttr, traces.length);
@@ -372,6 +376,7 @@ function computeDataBindings(gd, args) {
                 thisTraces[j] = traces ? traces[j] : j;
             }
         } else {
+            attr = _attr;
             thisTraces = traces ? traces.slice() : null;
         }