Currently popup notification shows the last text message in chat window then this user is sending me a file. Even if this message was mine.
2.5.1 still there
As mentioned here http://www.igniterealtime.org/forum/message.jspa?messageID=147490#147490 these popups are really confusing and missleading. If something is sending you a message, he can wait and message will stay in chat. But file transfer will be canceled if you wount answer quickly enough.
cant test it with 2.5.5 right now