back button bug

[Laurent Granger]

when you press the back button, you should come back to the exact spot you 
left the page at.
this usually works, but doesn't if there is an anchor (with #) in the 
address bar.

see <http://lgdev.free.fr/mozilla/p1.html> for an example

is this bug already in bugzilla?
i haven't found it.
if it isn't i'll report the bug.