* The merged mr does not display the merge button.

module/mr/ui/actions.html.php

@@ -20,7 +20,7 @@ foreach($config->mr->view->operateList as $operate)
 {
     if(!common::hasPriv('mr', $operate == 'reject' ? 'approval' : $operate)) continue;
     if($operate == 'reopen' && (!$MR->synced || $rawMR->state != 'closed')) continue;
-    if($rawMR->state == 'closed' && $operate == 'accept') continue;
+    if(in_array($rawMR->state, array('closed', 'merged')) && $operate == 'accept') continue;
 
     $action = $config->mr->actionList[$operate];
     if($operate === 'edit' || $operate === 'delete')