Fix event rect when moving zoom extent - #786

c3.js

@@ -5261,7 +5261,7 @@
             .on('zoomend', function () {
                 var event = d3.event.sourceEvent;
                 // if click, do nothing. otherwise, click interaction will be canceled.
-                if (event && startEvent.x === event.x && startEvent.y === event.y) {
+                if (event && startEvent.clientX === event.clientX && startEvent.clientY === event.clientY) {
                     return;
                 }
                 $$.redrawEventRect();

src/zoom.js

@@ -13,7 +13,7 @@ c3_chart_internal_fn.initZoom = function () {
         .on('zoomend', function () {
             var event = d3.event.sourceEvent;
             // if click, do nothing. otherwise, click interaction will be canceled.
-            if (event && startEvent.x === event.x && startEvent.y === event.y) {
+            if (event && startEvent.clientX === event.clientX && startEvent.clientY === event.clientY) {
                 return;
             }
             $$.redrawEventRect();