Add table html-id to subrecords, created by QFQ. Needed for tablesorter.

extension/Classes/Core/AbstractBuildForm.php

@@ -2661,7 +2661,10 @@ abstract class AbstractBuildForm {
             $dndAttributes .= Support::doAttribute('data-columns', $numColumns);
         }
 
+        $tableSorterHtmlId = $this->store::getVar(TYPO3_PAGE_ALIAS, STORE_TYPO3) . '-' . $formElement[FE_ID];
         $attribute = Support::doAttribute('class', $formElement[FE_SUBRECORD_TABLE_CLASS]);
+        $attribute .= ' ' . Support::doAttribute('id', $tableSorterHtmlId);
+
 
         return Support::wrapTag("<table $attribute>",
             $htmlHead . Support::wrapTag("<tbody $dndAttributes>", $htmlBody), true);