3.4.1 negative mana display

[scud]

Can't see anything on Trac, and I'm sure that if a Trac report is necessary then a grown-up will be able to phrase the problem much more coherently than I can.

Dave II, tyro paladin, has stumbled across vanilla Adamantite plate mail at 250'. Unbuckling his leather armour and struggling his way into the plate mail – wow but that's heavy – he notices his mana is unchanged. He then tries to throw out a detect evil and is told he has insufficient mana to do so.

The plate mail has obviously taken his mana to zero or below, but continues to display the previous values of 10/10. Removing half a dozen AC points of other gear will reset the mana to a genuine (if uselessly low) value.