Treat as multiple xs when scatter plot - #526

c3.js

@@ -1436,7 +1436,7 @@
         return this.d3.set(Object.keys(xs).map(function (id) { return xs[id]; })).size() > 1;
     };
     c3_chart_internal_fn.isMultipleX = function () {
-        return notEmpty(this.config.data_xs) || !this.config.data_xSort;
+        return notEmpty(this.config.data_xs) || !this.config.data_xSort || this.hasType('scatter');
     };
     c3_chart_internal_fn.addName = function (data) {
         var $$ = this, name;

src/data.js

@@ -47,7 +47,7 @@ c3_chart_internal_fn.hasMultipleX = function (xs) {
     return this.d3.set(Object.keys(xs).map(function (id) { return xs[id]; })).size() > 1;
 };
 c3_chart_internal_fn.isMultipleX = function () {
-    return notEmpty(this.config.data_xs) || !this.config.data_xSort;
+    return notEmpty(this.config.data_xs) || !this.config.data_xSort || this.hasType('scatter');
 };
 c3_chart_internal_fn.addName = function (data) {
     var $$ = this, name;