Resolve "Sichtbarkeitseinstellung: irreführender Hinweis"

Closes #3859

Merge request studip/studip!2770

lib/seminar_open.php

@@ -222,7 +222,15 @@ if (is_object($GLOBALS['user'])
     die;
 }
 
-if (Config::get()->USER_VISIBILITY_CHECK && is_object($GLOBALS['user']) && $GLOBALS['user']->id !== 'nobody') {
+if (
+    Config::get()->USER_VISIBILITY_CHECK
+    && is_object($GLOBALS['user'])
+    && $GLOBALS['user']->id !== 'nobody'
+    && !(
+        Config::get()->DOZENT_ALWAYS_VISIBLE
+        && $perm->get_perm() === 'dozent'
+    )
+) {
     require_once('lib/user_visible.inc.php');
     first_decision($GLOBALS['user']->id);
 }