Index: modules/file/file.module
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- modules/file/file.module	(date 1440760780000)
+++ modules/file/file.module	(revision )
@@ -686,7 +686,7 @@
 
   $attributes = array();
   if (isset($element['#id'])) {
-    $attributes['id'] = $element['#id'];
+    $attributes['id'] = 'div-' . $element['#id'];
   }
   if (!empty($element['#attributes']['class'])) {
     $attributes['class'] = (array) $element['#attributes']['class'];