Fix grouped tooltip ignored for scatter

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 || this.hasType('scatter');
+    return notEmpty(this.config.data_xs) || !this.config.data_xSort;// || this.hasType('scatter');
 };
 c3_chart_internal_fn.addName = function (data) {
     var $$ = this, name;

src/grid.js

@@ -174,7 +174,7 @@ c3_chart_internal_fn.showXGridFocus = function (selectedData) {
         xx = $$.xx.bind($$);
     if (! config.tooltip_show) { return; }
     // Hide when scatter plot exists
-    if ($$.hasType('scatter') || $$.hasArcType()) { return; }
+    if (/*$$.hasType('scatter') || */$$.hasArcType()) { return; }
     focusEl
         .style("visibility", "visible")
         .data([dataToShow[0]])