AHA!
Found it!
- open a topic (obviously :P)
- quick modify a message and save (I didn't try with cancel)
- scroll down to quick reply
- type something and hit preview
=> expected: go to post page
=> observed: the message is posted
I thought I fixed this...
Bug reopened since it's broken again.
I just noticed the first message doesn't match with the second...
I probably confused a couple of topics. lol
Fixed again. :P