The first edit I did through the editing page, but I realized I forgot to add
[tags] and used the in-page editor. The two edits were 10 seconds apart, but the second one generated a new revision (not what I would have expected).
I'm not sure if this is a bug or by design. I'd prefer if there was an edit window in this situation, but I understand that it probably doesn't come up that often. I just figured to report it in case this is not what Jeff & company intended to have happen.
EDIT: Another case of no edit window here (revisions 2 and 3): http://meta.stackoverflow.com/posts/52835/revisions
I used the inline tool for my edit, and the 2nd edit was within 5 minutes, yet it generated a new revision. Note also that the 2nd edit contained the exact same content as my edit, except for the commentary. When the post was at revision 3, I was unable to rollback to revision 2 (I think this is probably a separate issue, but just mentioning). (We have determined this behaviour is not isolated to the inline tag editing tool.)
UPDATE: Is this fixed now? That was actually an inline edit and two manual edits combined in one revision.