remove obsolete scroll check

Author: monfera

src/traces/sankey/plot.js

@@ -131,8 +131,8 @@ module.exports = function plot(gd, calcData) {
         var hoverCenterY = boundingBox.top + boundingBox.height / 2;
 
         var tooltip = Fx.loneHover({
-            x: hoverCenterX - rootBBox.left + window.scrollX,
-            y: hoverCenterY - rootBBox.top + window.scrollY,
+            x: hoverCenterX - rootBBox.left,
+            y: hoverCenterY - rootBBox.top,
             name: d3.format(d.valueFormat)(d.link.value) + d.valueSuffix,
             text: [
                 d.link.label,
@@ -181,9 +181,9 @@ module.exports = function plot(gd, calcData) {
         var hoverCenterY = boundingBox.top + boundingBox.height / 4 - rootBBox.top;
 
         var tooltip = Fx.loneHover({
-            x0: hoverCenterX0 + window.scrollX,
-            x1: hoverCenterX1 + window.scrollX,
-            y: hoverCenterY + window.scrollY,
+            x0: hoverCenterX0,
+            x1: hoverCenterX1,
+            y: hoverCenterY,
             name: d3.format(d.valueFormat)(d.node.value) + d.valueSuffix,
             text: [
                 d.node.label,