Issue #2991181 by bluegeek9: Properties are also shown as available field mappings

Closes #2991181

ldap_user/src/Form/LdapUserMappingBaseForm.php

@@ -67,6 +67,17 @@ abstract class LdapUserMappingBaseForm extends ConfigFormBase implements LdapUse
    */
   protected $server;
 
+  /**
+   * Fields and properties to exclude from the mapping form.
+   */
+  protected $exclude = [
+    '[field.mail]',
+    '[field.name]',
+    '[field.pass]',
+    '[field.roles]',
+    '[field.status]',
+  ];
+
   /**
    * {@inheritdoc}
    */
@@ -156,6 +167,11 @@ abstract class LdapUserMappingBaseForm extends ConfigFormBase implements LdapUse
       }
     }
     $params = [$direction, $sid];
+    foreach ($this->exclude as $exclude) {
+      if (array_key_exists($exclude, $attributes)) {
+        unset($attributes[$exclude]);
+      }
+    }
 
     $this->moduleHandler->alter(
       'ldap_user_attributes',