From b0a38741df0d1ddab96f144fa58b622be5a5263c Mon Sep 17 00:00:00 2001
From: Thomas Khyn <thomas@ksytek.com>
Date: Thu, 14 Apr 2016 12:09:24 +1200
Subject: [PATCH 1/2] Mitigates rounding errors due to non-subpixel scroll
 values

---
 src/js/plugin/update-scroll.js | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/js/plugin/update-scroll.js b/src/js/plugin/update-scroll.js
index 40863c7..85f0e3f 100644
--- a/src/js/plugin/update-scroll.js
+++ b/src/js/plugin/update-scroll.js
@@ -52,12 +52,26 @@ module.exports = function (element, axis, value) {
   var i = instances.get(element);
 
   if (axis === 'top' && value >= i.contentHeight - i.containerHeight) {
-    element.scrollTop = value = i.contentHeight - i.containerHeight; // don't allow scroll past container
+    // don't allow scroll past container
+    value = i.contentHeight - i.containerHeight;
+    if (Math.abs(value - element.scrollTop) <= 1) {
+      // mitigates rounding errors on non-subpixel scroll values
+      value = element.scrollTop;
+    } else {
+      element.scrollTop = value;
+    }
     element.dispatchEvent(yEndEvent);
   }
 
   if (axis === 'left' && value >= i.contentWidth - i.containerWidth) {
-    element.scrollLeft = value = i.contentWidth - i.containerWidth; // don't allow scroll past container
+    // don't allow scroll past container
+    value = i.contentWidth - i.containerWidth;
+    if (Math.abs(value - element.scrollLeft) <= 1) {
+      // mitigates rounding errors on non-subpixel scroll values
+      value = element.scrollLeft;
+    } else {
+      element.scrollLeft = value;
+    }
     element.dispatchEvent(xEndEvent);
   }
 

From 2cac43ef39a0a5d029ee11eef045a1be525eb18d Mon Sep 17 00:00:00 2001
From: Thomas Khyn <thomas@ksytek.com>
Date: Thu, 14 Apr 2016 12:25:50 +1200
Subject: [PATCH 2/2] Taking the absolute value is actually not necessary

---
 src/js/plugin/update-scroll.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/js/plugin/update-scroll.js b/src/js/plugin/update-scroll.js
index 85f0e3f..1fb40e4 100644
--- a/src/js/plugin/update-scroll.js
+++ b/src/js/plugin/update-scroll.js
@@ -54,7 +54,7 @@ module.exports = function (element, axis, value) {
   if (axis === 'top' && value >= i.contentHeight - i.containerHeight) {
     // don't allow scroll past container
     value = i.contentHeight - i.containerHeight;
-    if (Math.abs(value - element.scrollTop) <= 1) {
+    if (value - element.scrollTop <= 1) {
       // mitigates rounding errors on non-subpixel scroll values
       value = element.scrollTop;
     } else {
@@ -66,7 +66,7 @@ module.exports = function (element, axis, value) {
   if (axis === 'left' && value >= i.contentWidth - i.containerWidth) {
     // don't allow scroll past container
     value = i.contentWidth - i.containerWidth;
-    if (Math.abs(value - element.scrollLeft) <= 1) {
+    if (value - element.scrollLeft <= 1) {
       // mitigates rounding errors on non-subpixel scroll values
       value = element.scrollLeft;
     } else {