[crossfire] Client display issue

[Nicolas Weeger]

Hello.

With current CVS GTK client, there's a big display issue with
multiplart images.
Client apparently keeps old parts in memory, and won't erase'em.
Casting spells doesn't change display, but using dimension door (thus
invalidating cache) fixes the trouble.
So I'd guess it's related to caching. But someone who knows more about
multipart can tell better :)

Ryo