User Fram noticed:
- Create a topic without a first post (i.e. fill in "New topic" title but don't fill in "Add some details if you'd like" textarea).
- Then click the _Be the first to comment_ link in the new topic bar.
Result: The input focus jumps to the textarea, but
a) no Cancel [Preview] [Reply] buttons
b) the textarea auto-expand feature is disabled.
In Firefox, if you go to another tab and return then the textarea auto-expand kicks in (slowly animating), but still no buttons. You have to actually click in the textarea to get the Cancel [Preview] [Reply] buttons to appear.