prevent sending the comment twice

[Ebrahim Mohammadi]

Look 4th and 5th comments here: http://brainstorm.ubuntu.com/idea/3443/
This was because I pushed the "Post your comment" button twice by mistake. Prevent this from happening.
Maybe giving each comment a unique id (which is generated when code if that comment textbox is generated) and checking that id on the server side, is a solution.

[Dean Sas (dsas)]

Do we want to stop the user ever making an identical comment on an item or just not let them make a comment identical to the last comment if they were the last commenters.

I can imagine that we should allow the following conversation..
John Smith: I think that xxxxxxx
Jane Jones: +1!
Peter Griffin +1 I think that xxxxx and yyyyy too
Jane Jones +1!

[Nicolas Deschildre (ndeschildre)]

IMO the best way to fix this is to handle submissions the same way we do with idea :
we set up a minimum interval of time between each idea (one minute). Advantages:
- We fix the aforementioned problem
- We prevent to some extend easy spamming