Selon Mirko Thiessen wikipedia@mirko-thiessen.de:
Hi,
I hope this is the right list for doing this: I would like to point out the high urgency of bug report 548 (from September 22). There is a problem when uploading images under a name which is already in use. You will get a notice that there is already an image of that name and a query if you want to overwrite the image. If you do nothing (i.e. you press neither yes or no) the old image will be overwritten without any log entry. Thus we are losing images without the possibility to restore the old versions. I detected four occurrences of this bug by now, but there may be many more. Thanks for your help.
Hi
The bug was already discovered, and a patch was coded.... but not applied in the CVS ?!
cf:http://bugzilla.wikipedia.org/show_bug.cgi?id=548
Emmanuel Engelhart