Workaround for duplicates in `wcf1_message_embedded_object`

see https://github.com/WoltLab/WCF/issues/5719

diff --git a/wcfsetup/install/files/lib/data/attachment/GroupedAttachmentList.class.php b/wcfsetup/install/files/lib/data/attachment/GroupedAttachmentList.class.php
index faf134a949639f952fe2d3e8ee36f1c88264dc7f..8b2fc73acf1785260d383078c9d36223ab8d01d8 100644 (file)
--- a/wcfsetup/install/files/lib/data/attachment/GroupedAttachmentList.class.php
+++ b/wcfsetup/install/files/lib/data/attachment/GroupedAttachmentList.class.php
@@ -53,7 +53,7 @@ class GroupedAttachmentList extends AttachmentList
 
         $this->getConditionBuilder()->add(
             '(
-                SELECT  embeddedObjectID
+                SELECT  DISTINCT embeddedObjectID
                 FROM    wcf' . WCF_N . '_message_embedded_object
                 WHERE   messageObjectTypeID = ?
                     AND messageID = attachment.objectID