TYPO3 Core

Info: This affects the search in top-right corner of the backend, after clicking on the "Show all" button, if an editor user has too many searchable webmounts.

The id list returned by typo3_src/typo3/sysext/recordlist/Classes/RecordList/DatabaseRecordList.php->getSearchableWebmounts can contain ids multiple times.

We encountered a problem in a large TYPO3 system where this function returned about 78000 ids instead of about 2300 unique ids for an editor. This led to the error, that the sql query in DatabaseRecordList.php->getTable executed by $queryBuilderTotalItems had too many placeholders.

In my opinion, this bug can be easily fixed, by calling array_unique on the id list before saving it to the runtime cache and returning it from the function.

https://github.com/TYPO3-CMS/recordlist/blob/main/Classes/RecordList/DatabaseRecordList.php#L2860