Ticket system bugfixes with filename handling

classes/Modules/SystemMailer/SystemMailer.php

@@ -145,8 +145,11 @@ final class SystemMailer
 
         $email = new EmailMessage($subject, $body, $recipients, $ccs, $bccs);
         foreach ($attachFiles as $file) {
+            $this->logger->debug("Attaching file", ['filename' => $file]);
             if ($file !== null && file_exists($file)) {
                 $email->addAttachment(new FileAttachment($file));
+            } else {
+                $this->logger->debug("Attaching file failed", ['filename' => $file]);
             }
         }
 

classes/Modules/Ticket/Task/TicketImportHelper.php

@@ -769,7 +769,7 @@ class TicketImportHelper
                         $dateiname = $this->formatter->encodeToUtf8($dateiname);
                         $dateiname = htmlspecialchars_decode($dateiname);
                     }
-                    if (stripos(strtoupper($dateiname), 'UTF-8\'\'') == 0) {
+                    if (stripos(strtoupper($dateiname), 'UTF-8\'\'') === 0) {
                         $dateiname = $this->formatter->encodeToUtf8(urldecode(substr($dateiname,7)));
                         $dateiname = htmlspecialchars_decode($dateiname);
                     }