Add mobile scrollback as setting for sidebar

src/definitions/modules/sidebar.js

@@ -298,11 +298,9 @@ $.fn.sidebar = function(parameters) {
           }
           else {
             if(module.is.mobile()) {
-              requestAnimationFrame(function() {
-                $module.scrollTop(0);
-                currentScroll = $(window).scrollTop();
-                window.scrollTo(0, 0);
-              });
+              $module.scrollTop(0);
+              currentScroll = $(window).scrollTop();
+              window.scrollTo(0, 0);
             }
             module.remove.allVisible();
             requestAnimationFrame(transition);
@@ -323,24 +321,27 @@ $.fn.sidebar = function(parameters) {
           ;
           module.verbose('Removing context push state', module.get.direction());
           module.unbind.clickaway();
+
           $transition
             .on(transitionEnd, function(event) {
               if( event.target == $transition[0] ) {
-                if(module.is.mobile()) {
-                  window.scrollTo(0, currentScroll);
-                }
                 $transition.off(transitionEnd);
                 module.remove.transition();
                 module.remove.direction();
                 module.remove.outward();
                 module.remove.visible();
+                if(module.is.mobile() && settings.returnScroll) {
+                  window.scrollTo(0, currentScroll);
+                }
                 $.proxy(callback, element)();
               }
             })
           ;
-          module.set.outward();
-          module.remove.active();
-          module.remove.pushed();
+          requestAnimationFrame(function() {
+            module.set.outward();
+            module.remove.active();
+            module.remove.pushed();
+          });
         },
 
         set: {
@@ -669,6 +670,7 @@ $.fn.sidebar.settings = {
   exclusive        : true,
 
   scrollLock       : false,
+  returnScroll     : false,
 
   onChange         : function(){},
   onShow           : function(){},