When somebody replies to a notification mail that was generated by assigning him an issue, this reply gets added to that issue as a comment. That's OK, we want that to happen.
But the problem is that the whole reply is included in this comment, even the quoted part with the text that is already in the issue description.
How can we avoid that and setup that only what a user writes in reply email is entered as a comment?
P.S. Many other systems have such a feature enabled, they put a line in the email with some identifier and saying reply above this line.