When you are writing a comment, type something with 14 characters. It will tell you that you need one more at least. Leave a space. It will look like you can post the comment. Try posting it, it says you can't. But according to the counter just below the text-area, you should be fine.
migrated from stackoverflow.com Jan 21 '13 at 1:14
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The message showing the number of characters that are still necessary to reach the minimum comment length, or the number of characters that you can still type is shown on browser side, while the validation of the comment is done server-side.
The error message could be changed as the following, but then it should list all the characters that are removed.
For example, 15 spaces followed by a back-tick still cause the error to appear.
Probably the message should be similar to the following one, if it needs to really be changed.