Fix for #4550

Also fixes dropdowns hiding behavior for case when two or more dropdowns
with [data-toggle=dropdown] exist on the page

js/bootstrap-dropdown.js

@@ -100,8 +100,9 @@
   }
 
   function clearMenus() {
-    getParent($(toggle))
-      .removeClass('open')
+    $(toggle).each(function () {
+      getParent($(this)).removeClass('open')
+    })
   }
 
   function getParent($this) {