Index: modules/overlay/overlay.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/overlay/overlay.module,v
retrieving revision 1.23
diff -u -p -r1.23 overlay.module
--- modules/overlay/overlay.module	8 Jul 2010 12:20:23 -0000	1.23
+++ modules/overlay/overlay.module	11 Jul 2010 22:47:48 -0000
@@ -58,6 +58,38 @@ function overlay_theme() {
 }
 
 /**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function overlay_form_user_profile_form_alter(&$form, &$form_state) {
+  if ($form['#user_category'] == 'account') {
+    $account = $form['#user'];
+    if (user_access('access overlay', $account)) {
+      $form['overlay_control'] = array(
+        '#type' => 'fieldset',
+        '#title' => t('Administrative overlay'),
+        '#collapsible' => TRUE,
+      );
+
+      $form['overlay_control']['overlay'] = array(
+        '#type' => 'checkbox',
+        '#title' => t('View administrative pages in the overlay.'),
+        '#description' => t('The overlay shows administrative pages with a transparent black background over the page you started from.'),
+        '#default_value' => isset($account->data['overlay']) ? $account->data['overlay'] : 1,
+      );
+    }
+  }
+}
+
+/**
+ * Implements hook_user_presave().
+ */
+function overlay_user_presave(&$edit, $account, $category) {
+  if (isset($edit['overlay'])) {
+    $edit['data']['overlay'] = $edit['overlay'];
+  }
+}
+
+/**
  * Implements hook_init().
  *
  * Determine whether the current page request is destined to appear in the
@@ -67,13 +99,14 @@ function overlay_theme() {
  */
 function overlay_init() {
   // @todo: custom_theme does not exist anymore.
-  global $custom_theme;
+  global $custom_theme, $user;
 
   $mode = overlay_get_mode();
 
   // Only act if the user has access to the overlay and a mode was not already
   // set. Other modules can also enable the overlay directly for other uses.
-  if (empty($mode) && user_access('access overlay')) {
+  $use_overlay = !isset($user->data['overlay']) || $user->data['overlay'];
+  if (empty($mode) && user_access('access overlay') && $use_overlay) {
     $current_path = current_path();
     // After overlay is enabled on the modules page, redirect to
     // <front>#overlay=admin/modules to actually enable the overlay.