Disable touch scroll handling

The app had some ad-hoc code to manage scroll events, which
was causing problems on some touch screens. It's also
unnecessary, as the items always fit vertically inside the
nav pane. So remove the handler code.

Author: townxelliot

app/js/flashcards.js

@@ -503,14 +503,6 @@ define(['getMessage', 'license', 'sound'], function (getMessage, license_init, G
         }
     };
 
-    /**
-     * FlashCards.scrollNavPane will scroll the navigation Pane the direction the user moves the mouse
-     * @private
-     */
-    FlashCards.prototype.scrollNavPane = function (delta) {
-        document.getElementById("scroll-items").style.webkitTransform = "translateY("+delta+"px)";
-    };
-
     /**
      * FlashCards.setGameEventListeners sets event handlers for the game
      * @private
@@ -527,19 +519,6 @@ define(['getMessage', 'license', 'sound'], function (getMessage, license_init, G
         document.getElementById("nav-pane").addEventListener('click', function () {
             self.navPaneClicked();
         }, false);
-        document.getElementById("scroll-overlay").addEventListener('mousedown', function (e) {
-            starty = e.clientY;
-            isDrag = 0; //mouse down
-        }, false);
-        document.getElementById("scroll-overlay").addEventListener('mousemove', function (e) {
-            isDrag = 1; //mouse move
-        }, false);
-        document.getElementById("scroll-overlay").addEventListener('mouseup', function (e) {
-            if(isDrag === 1) { //if equals 1 is drag event
-                self.scrollNavPane((-1)*(starty-e.clientY));
-            }
-            isDrag = -1; //regardless reset endy
-        }, false);
         document.getElementById("shape-deck").addEventListener('click', function (e) {
             e.stopPropagation();
             self.shapeDeckClicked();