Progressbar jumps to 0% when filesize changes

[sezz]

Build 924 - Registered - XP Pro - Router - Firewall - Norton AV - ISDN
FTP Server: ProFTPD 1.2.8

When I'm downloading a file and the filesize changes while downloading (let's say when I start downloading it has 100kb, after some seconds it has 200kb (eg a logfile)), the progressbar jumps to 0% when I reach the 100kb.

maybe it would be better, if the progressbar would stay at 100%!

[bigstar]

This is the intended behavior, otherwise people will wonder why it says 100% but the transfer is still going (this was the previous behavior).