Add comment thumbnail rendering for file attachments.
Review Request #3651 — Created Dec. 11, 2012 and submitted
Add comment thumbnail rendering for file attachments. This gives file attachments the ability to render the contextual thumbnail for a comment. By default, there's no thumbnail, but a ReviewUI can provide a get_comment_thumbnail function that returns HTML representing the comment. So far, only ImageReviewUI implement this. Comments made on image files now show the region commented on, just like screenshots.
Viewed some comments I already had on image file attachments. Saw that the commented area appeared as a preview.