diff --git a/modules/file/tests/file.test b/modules/file/tests/file.test
index 0f6a578..ca76bb5 100644
--- a/modules/file/tests/file.test
+++ b/modules/file/tests/file.test
@@ -877,6 +877,7 @@ class FileFieldDisplayTestCase extends FileFieldTestCase {
     $field_settings = array(
       'display_field' => '1',
       'display_default' => '1',
+      'cardinality' => FIELD_CARDINALITY_UNLIMITED,
     );
     $instance_settings = array(
       'description_field' => '1',
@@ -917,6 +918,17 @@ class FileFieldDisplayTestCase extends FileFieldTestCase {
 
     $this->assertNoRaw($default_output, 'Field is hidden when "display" option is unchecked.');
 
+    // Test that fields appear as expected after during the preview.
+    // Add a second file.
+    $name = 'files[' . $field_name . '_' . LANGUAGE_NONE . '_1]';
+    $edit[$name] = drupal_realpath($test_file->uri);
+
+    // Uncheck the display checkboxes and go to the preview.
+    $edit[$field_name . '[' . LANGUAGE_NONE . '][0][display]'] = FALSE;
+    $edit[$field_name . '[' . LANGUAGE_NONE . '][1][display]'] = FALSE;
+    $this->drupalPost('node/' . $nid . '/edit', $edit, t('Preview'));
+    $this->assertRaw($field_name . '[' . LANGUAGE_NONE . '][0][display]', 'First file appears as expected.');
+    $this->assertRaw($field_name . '[' . LANGUAGE_NONE . '][1][display]', 'Second file appears as expected.');
   }
 }
 
diff --git a/modules/node/node.pages.inc b/modules/node/node.pages.inc
index 6267463..cc3908e 100644
--- a/modules/node/node.pages.inc
+++ b/modules/node/node.pages.inc
@@ -371,35 +371,38 @@ function node_form_build_preview($form, &$form_state) {
  * @see node_form_build_preview()
  */
 function node_preview($node) {
-  if (node_access('create', $node) || node_access('update', $node)) {
-    _field_invoke_multiple('load', 'node', array($node->nid => $node));
+  // Clone the node before previewing it to prevent the node itself from being
+  // modified.
+  $cloned_node = clone $node;
+  if (node_access('create', $cloned_node) || node_access('update', $cloned_node)) {
+    _field_invoke_multiple('load', 'node', array($cloned_node->nid => $cloned_node));
     // Load the user's name when needed.
-    if (isset($node->name)) {
+    if (isset($cloned_node->name)) {
       // The use of isset() is mandatory in the context of user IDs, because
       // user ID 0 denotes the anonymous user.
-      if ($user = user_load_by_name($node->name)) {
-        $node->uid = $user->uid;
-        $node->picture = $user->picture;
+      if ($user = user_load_by_name($cloned_node->name)) {
+        $cloned_node->uid = $user->uid;
+        $cloned_node->picture = $user->picture;
       }
       else {
-        $node->uid = 0; // anonymous user
+        $cloned_node->uid = 0; // anonymous user
       }
     }
-    elseif ($node->uid) {
-      $user = user_load($node->uid);
-      $node->name = $user->name;
-      $node->picture = $user->picture;
+    elseif ($cloned_node->uid) {
+      $user = user_load($cloned_node->uid);
+      $cloned_node->name = $user->name;
+      $cloned_node->picture = $user->picture;
     }
 
-    $node->changed = REQUEST_TIME;
-    $nodes = array($node->nid => $node);
+    $cloned_node->changed = REQUEST_TIME;
+    $nodes = array($cloned_node->nid => $cloned_node);
     field_attach_prepare_view('node', $nodes, 'full');
 
     // Display a preview of the node.
     if (!form_get_errors()) {
-      $node->in_preview = TRUE;
-      $output = theme('node_preview', array('node' => $node));
-      unset($node->in_preview);
+      $cloned_node->in_preview = TRUE;
+      $output = theme('node_preview', array('node' => $cloned_node));
+      unset($cloned_node->in_preview);
     }
     drupal_set_title(t('Preview'), PASS_THROUGH);