From 9588c702fee4fdae4a9f92dbd0eb05afa83cc937 Mon Sep 17 00:00:00 2001
From: Henry <henrybarnathan@me.com>
Date: Tue, 24 Dec 2019 10:54:00 -0500
Subject: [PATCH] iOS 13 bugfix

---
 js/drag.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/js/drag.js b/js/drag.js
index ad199001..d993b202 100644
--- a/js/drag.js
+++ b/js/drag.js
@@ -218,7 +218,6 @@ proto.dragMove = function( event, pointer, moveVector ) {
   }
   event.preventDefault();
 
-  this.previousDragX = this.dragX;
   // reverse if right-to-left
   var direction = this.options.rightToLeft ? -1 : 1;
   if ( this.options.wrapAround ) {
@@ -235,6 +234,10 @@ proto.dragMove = function( event, pointer, moveVector ) {
     dragX = dragX < endBound ? ( dragX + endBound ) * 0.5 : dragX;
   }
 
+  if (this.dragX !== dragX) {
+    this.previousDragX = this.dragX;
+  }
+  
   this.dragX = dragX;
 
   this.dragMoveTime = new Date();