Merge pull request #33813 from nextcloud/fix/infinite_email_change_no…

…tification

Compare lowercase email when updating from ldap

lib/private/User/User.php

@@ -199,7 +199,7 @@ public function setSystemEMailAddress(string $mailAddress): void {
  $this->setPrimaryEMailAddress('');
  }
 
- if ($oldMailAddress !== $mailAddress) {
+ if ($oldMailAddress !== strtolower($mailAddress)) {
  $this->triggerChange('eMailAddress', $mailAddress, $oldMailAddress);
  }
  }