[PATCH 0 of 2] Paint patches

[Ingo Proetel]

Hello,

these two patches improve the painting of CacioPeers. The first patch gives the target implementation better control over clearing the peers background. The second patch disables peerPaint on Windows that have native decoration. This minimizes unnecessary paints.

I think that the second patch is a temporary solution. At some point I'd like to split decoration issues from CacioWindowPeer into a CacioDecoratingWindowPeer subclass. This would simplify the handling between decorating and non-decorating CacioPeers.

Cheers
Ingo