[BUGFIX] Set focus on the search input field in page tree

After clicking on the filter button in the page tree,
the focus is set on the input field allowing to type
search word right away.

Resolves: #83535
Releases: master
Change-Id: I78c9b81e7c9e23efb4f9e8bf2d2a222a5e97436c
Reviewed-on: https://review.typo3.org/55436


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>

typo3/sysext/backend/Resources/Public/JavaScript/PageTree/PageTreeToolbar.js

@@ -168,6 +168,7 @@ define(['jquery',
 
           $toolbar.find('[data-tree-submenu]').not($submenu).removeClass('active');
           $submenu.toggleClass('active', $this.hasClass('active'));
+          $submenu.find('input').focus();
         });
       });