Implement dynamic loading for IMP_Prefs_Identity

Add dynamic loading of IMP_Prefs_Identity class if not already loaded.

Author: TDannhauer

lib/Factory/Identity.php

@@ -31,6 +31,20 @@ class IMP_Factory_Identity extends Horde_Core_Factory_Injector
      */
     public function create(Horde_Injector|Injector $injector)
     {
+        if (!class_exists('IMP_Prefs_Identity', false)) {
+            if (defined('IMP_BASE')) {
+                $file = IMP_BASE . '/lib/Prefs/Identity.php';
+            } else {
+                $registry = $injector->getInstance('Horde_Registry');
+                $fileroot = $registry->get('fileroot', 'imp');
+                $file = $fileroot ? $fileroot . '/lib/Prefs/Identity.php' : null;
+            }
+
+            if (!empty($file) && is_readable($file)) {
+                require_once $file;
+            }
+        }
+
         return $injector->getInstance('Horde_Core_Factory_Identity')->create(null, 'imp');
     }