partial transparency gets opaque in F1 mode

Not sure if this is a related bug or not, but...

Tested in 1_5 PR.

I have edited the armor, helm, added a shadow to it (with partial transparency)
so if you use the helm in game, it will cover the players face with shadow, but not fully hide it = there is an opaque background.

everything works fine until you press F1 for screenshoting.

the shadow gets rendered opaque.