Issue #1116326 by s_leu, yannickoo, dawehner, nod_, pwolanin, David_Rothstein, ksenzee, realityloop, miro_dietiker, broeker, mariagwyn, Christian DeLoach: Support admin overlay in exposed forms

CHANGELOG.txt

@@ -47,6 +47,9 @@ Drupal 7.50, xxxx-xx-xx (development version)
   broke contributed modules that override the "admin/people" page.
 - Fixed a bug which caused ip_address() to return nothing when the client IP
   address and proxy IP address are the same.
+- Made method="get" forms work inside the administrative overlay. The fix adds
+  a new hidden field to these forms when they appear inside the overlay (minor
+  data structure change).
 
 Drupal 7.44, 2016-06-15
 -----------------------

modules/overlay/overlay.module

@@ -78,6 +78,20 @@ function overlay_theme() {
   );
 }
 
+/**
+ * Implements hook_form_alter().
+ */
+function overlay_form_alter(&$form, &$form_state) {
+  // Add a hidden element to prevent dropping out of the overlay when a form is
+  // submitted inside the overlay using a GET method.
+  if (isset($form['#method']) && $form['#method'] == 'get' && isset($_REQUEST['render']) && $_REQUEST['render'] == 'overlay' && !isset($form['render'])) {
+    $form['render'] = array(
+      '#type' => 'hidden',
+      '#value' => 'overlay',
+    );
+  }
+}
+
 /**
  * Implements hook_form_FORM_ID_alter().
  */