Requested feature overview description.
When adding or editing the description of an image post, a button would be added underneath the text box that allows the user to preview what they've written in DText, much like for forum posts.

Why would it be useful?
If you're trying to copy a description from the source, and be faithful with links, lists, headers, etc., it'd be helpful if you could make sure you're doing things right.

What part(s) of the site page(s) are affected?
Uploading a post and editing a post

(forum "post" and image "post" use the same terms, so hopefully this isn't confusing)