[quote=Mahz]
- Can't reproduce the Preview mode messing with native undo. The BBCode editor buttons themselves mess with undo because they don't trigger "InsertText" events. So interleaving manual writing with BBCode buttons will hose the undo system.
[/quote]

Just tried without any BBCode, still can't undo.
[img]http://zippy.gfycat.com/CelebratedQuestionableBeauceron.gif[/img]
(also, .gif is supported. Nice)