The code now automatically selects uploading attachments in all workflows. In a workflow that selects multiple attachments, all attachments added to the upload queue are selected. In a workflow that selects a single attachment (e.g. selecting a featured image), the last attachment added to the upload queue is selected.
see #22817.
git-svn-id: https://develop.svn.wordpress.org/trunk@23259 602fd350-edb4-49c9-b593-d223f7449a82