more on undo work - remove transaction manager from folder array after retrieving it

mailnews/base/src/nsMessenger.cpp

@@ -454,12 +454,10 @@ nsMessenger::DoCommand(nsIRDFCompositeDataSource* db, char *command,
 	rv = rdfService->GetResource(command, getter_AddRefs(commandResource));
 	if(NS_SUCCEEDED(rv))
 	{
-
         // ** jt - temporary solution for pickybacking the undo manager into
         // the nsISupportArray
         if (mTxnMgr)
             srcArray->InsertElementAt(mTxnMgr, 0);
-
 		rv = db->DoCommand(srcArray, commandResource, argumentArray);
 	}
 

mailnews/base/src/nsMsgFolderDataSource.cpp

@@ -461,7 +461,10 @@ nsMsgFolderDataSource::DoCommand(nsISupportsArray/*<nsIRDFResource>*/* aSources,
     supports = getter_AddRefs(aSources->ElementAt(0));
     transactionManager = do_QueryInterface(supports, &rv);
     if (NS_SUCCEEDED(rv) && transactionManager)
-        i = 1;
+    {
+        aSources->RemoveElementAt(0);
+        cnt--;
+    }
   }
 
   for ( ; i < cnt; i++) {