bug 2810: use filename+date_creation to find duplicates and not only filename.

When using several camera, you quickly have the same filenames with totally
different photos.


git-svn-id: http://piwigo.org/svn/trunk@29237 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/batch_manager.php

@@ -295,7 +295,7 @@ SELECT
     $query = '
 SELECT file
   FROM '.IMAGES_TABLE.'
-  GROUP BY file
+  GROUP BY file, date_creation
   HAVING COUNT(*) > 1
 ;';
     $duplicate_files = query2array($query, null, 'file');