this.$el is not the same as $('#app-content')

That is why we use `this.$el.parent()` instead

apps/files/js/filelist.js

@@ -51,7 +51,7 @@
 
 		// number of files per page, calculated dynamically
 		pageSize: function() {
-			return Math.ceil(this.$el.height() / 50);
+			return Math.ceil(this.$el.parent().height() / 50);
 		},
 
 		/**