Comment 5 for bug 482496

Unless I'm missing something, it should kick in if you are replying to a message which is in a different character encoding than your own default. Quoting that message, when it contains characters not representable in your default encoding, would prompt the upgrade to UTF-8, correct? In that case, the patch's behavior would override the user's preference to always reply in his or her own encoding. While for the reasons you mention it is questionable to send out a message with broken characters, that preference should be honored if set by the user.