MDL-68167 lib: Do not set aria-expanded if it should not be set

lib/amd/src/form-autocomplete.js

@@ -343,8 +343,12 @@ function($, log, str, templates, notification, LoadingIcon) {
         var inputElement = $(document.getElementById(state.inputId));
         var suggestionsElement = $(document.getElementById(state.suggestionsId));
 
-        // Announce the list of suggestions was closed, and read the current list of selections.
-        inputElement.attr('aria-expanded', false).attr('aria-activedescendant', state.selectionId);
+        if (inputElement.attr('aria-expanded') === "true") {
+            // Announce the list of suggestions was closed.
+            inputElement.attr('aria-expanded', false);
+        }
+        // Read the current list of selections.
+        inputElement.attr('aria-activedescendant', state.selectionId);
 
         // Hide the suggestions list (from screen readers too).
         suggestionsElement.hide().attr('aria-hidden', true);