Adding a note that if we're going to tweak the subject line, we need to make sure that all other possible threading information is preserved (e.g., 'References' header, 'In-reply-to', whatever else), so that thread is preserved despite the Subject tweaks.
Adding a note that if we're going to tweak the subject line, we need to make sure that all other possible threading information is preserved (e.g., 'References' header, 'In-reply-to', whatever else), so that thread is preserved despite the Subject tweaks.