Index: reference/jquery-plugins/select2-4.0.13/src/scss/theme/default/layout.scss
===================================================================
diff -u -r8bc78c4d52ae8ed855f537be6424cd554ec31e39 -r940d868ae80ed28d7dfd966faf63cce18d00253b
--- reference/jquery-plugins/select2-4.0.13/src/scss/theme/default/layout.scss	(.../layout.scss)	(revision 8bc78c4d52ae8ed855f537be6424cd554ec31e39)
+++ reference/jquery-plugins/select2-4.0.13/src/scss/theme/default/layout.scss	(.../layout.scss)	(revision 940d868ae80ed28d7dfd966faf63cce18d00253b)
@@ -811,6 +811,12 @@
 				break;
 		}
 	});
+
+	$("#mmenu .form-search").submit(function (event) {
+		event.preventDefault();
+
+		$(jQueryElementID).jstree("search", document.getElementById("text").value);
+	});
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////