It appears that if you mark a post to quote it, but then don't use it, the quote remains active, even if you go to another thread.
I just had that happen to me. I picked two items I wanted to quote then clicked on the "Quote" button in the message reply block. A new (small) window opened up with about 4 quotes, two of which seemed to be from another thread. However this new window does offer the option to delete unwanted quotes.
I just had that happen to me. I picked two items I wanted to quote then clicked on the "Quote" button in the message reply block. A new (small) window opened up with about 4 quotes, two of which seemed to be from another thread. However this new window does offer the option to delete unwanted quotes.