[BUGFIX] Duplicate ids in form view on record translation

If a record shall be localized in the page module the accordant
form view gets loaded twice with the same id.

Fixes: #41659
Releases: 6.0
Change-Id: I396518433170e032b09d1d1026fc7fe6c3b0b85f
Reviewed-on: http://review.typo3.org/15383
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel

typo3/sysext/backend/Classes/View/PageLayoutView.php

@@ -1528,7 +1528,7 @@ class PageLayoutView extends \TYPO3\CMS\Recordlist\RecordList\AbstractDatabaseRe
 				$recs[$c] = $row['uid'];
 				// Create the list of the next three ids (for editing links...)
 				for ($a = 0; $a < $nextTree; $a++) {
-					if (isset($recs[$c - $a])) {
+					if (isset($recs[$c - $a]) && !\TYPO3\CMS\Core\Utility\GeneralUtility::inList($this->tt_contentData['nextThree'][$recs[$c - $a]], $row['uid'])) {
 						$this->tt_contentData['nextThree'][$recs[$c - $a]] .= $row['uid'] . ',';
 					}
 				}