XWIKI-23552: Search input outside viewport on small mobile devices (#4608)

* Added wrap on the place where it was missing.
* Added a check for sturdiness of the searchSuggest code.

Author: Sereza7

xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-resources/src/main/resources/flamingo/less/action-menus.less

@@ -28,6 +28,8 @@
 
     &.navbar-right {
       display: flex;
+      flex-wrap: wrap;
+      justify-content: flex-end;
     }
   }
   .navbar-form {

xwiki-platform-core/xwiki-platform-search/xwiki-platform-search-webjar/src/main/webjar/searchSuggest.js

@@ -129,7 +129,7 @@ var XWiki = (function (XWiki) {
     onSuggestCollapsed: function(event) {
       /* We match the collapse of the input field timing to close the suggest panel.
          As of 16.2.0-RC1, this value is defined in action-menus.less -> #headerglobalsearchinput */
-      this.suggest.resetTimeout($('#headerglobalsearchinput').css('transition-duration'));
+      this.suggest.resetTimeout($('#headerglobalsearchinput')?.css('transition-duration'));
     },
 
     /**