fix: filter out contacts with invalid email addresses in sharee completion

Signed-off-by: Julius Knorr <jus@bitgrid.net>

Author: juliusknorr

lib/private/Collaboration/Collaborators/MailPlugin.php

@@ -93,13 +93,19 @@ public function search($search, $limit, $offset, ISearchResult $searchResult): b
 					$emailAddresses = [$emailAddresses];
 				}
 				foreach ($emailAddresses as $type => $emailAddress) {
+
 					$displayName = $emailAddress;
 					$emailAddressType = null;
 					if (\is_array($emailAddress)) {
 						$emailAddressData = $emailAddress;
 						$emailAddress = $emailAddressData['value'];
 						$emailAddressType = $emailAddressData['type'];
 					}
+
+					if (!filter_var($emailAddress, FILTER_VALIDATE_EMAIL)) {
+						continue;
+					}
+
 					if (isset($contact['FN'])) {
 						$displayName = $contact['FN'] . ' (' . $emailAddress . ')';
 					}