If someone messes up the wiki-text of an issue comment, there's no way to edit the comment. The patch adds capability to add (and preview) notes in an issue. The 'Edit' link appears on the right next to the note anchor if either of the following are true:

• user has delete permission for issues
• user is original author of individual comment

Edit form appear inline, along with Preview and Cancel links.

Patch is against 0.6.4 and includes possibly some cruft regarding note preview that may not be necessary when applying to 0.7 code. Please examine patch and apply native intelligence.

Also, the patch tries to abstract the note editing stuff into the partial _note_form.rhtml, which is referenced in _history.rhtml. Unfortunately, I couldn't work out how it could be used in show.rhtml. show.rhtml seems to operate on @issue, while _note_form.rhtml expects @journal entries.