Ok I noted what happens:
svn commit -m "do not show Designer link if the required table is not defined"
Envoi phpMyAdmin/libraries/db_links.inc.php Envoi phpMyAdmin/libraries/relation.lib.php
Transmission des données ..svn: Échec de la propagation (commit), détails : svn: MERGE request failed on '/svnroot/phpmyadmin/trunk/phpMyAdmin/libraries' svn: MERGE of '/svnroot/phpmyadmin/trunk/phpMyAdmin/libraries': 500 Internal Server Error (https://svn.sourceforge.net)
So the commit is done (revision 9678) but my local copy is not updated. After a "svn update" my local copy gets updated.
Marc