Case insensitive search in contacts - fixes #22575

apps/dav/lib/carddav/carddavbackend.php

@@ -776,7 +776,7 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 			$query2->orWhere(
 				$query2->expr()->andX(
 					$query2->expr()->eq('cp.name', $query->createNamedParameter($property)),
-					$query2->expr()->like('cp.value', $query->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%'))
+					$query2->expr()->ilike('cp.value', $query->createNamedParameter('%' . $this->db->escapeLikeParameter($pattern) . '%'))
 				)
 			);
 		}

apps/dav/tests/unit/carddav/carddavbackendtest.php

@@ -547,8 +547,8 @@ class CardDavBackendTest extends TestCase {
 				['John', ['FN'], ['John Doe', 'John M. Doe']],
 				['M. Doe', ['FN'], ['John M. Doe']],
 				['Do', ['FN'], ['John Doe', 'John M. Doe']],
-				// check if duplicates are handled correctly
-				['John', ['FN', 'CLOUD'], ['John Doe', 'John M. Doe']],
+				'check if duplicates are handled correctly' => ['John', ['FN', 'CLOUD'], ['John Doe', 'John M. Doe']],
+				'case insensitive' => ['john', ['FN'], ['John Doe', 'John M. Doe']]
 		];
 	}