to hide the change from Client/Unmanaged and eventually also
act as the only API available to effects.
svn path=/branches/work/kwin_composite/; revision=626360
instances and keeping them around after the window is closed, create
class Deleted as a representation of a closed window.
svn path=/branches/work/kwin_composite/; revision=626356
Since it's unlikely XRender code will use other transformations then the ones
provided this should be ok. Makes painting with obscured windows much faster
(i.e. it's just slow, not bloody slow).
svn path=/branches/work/kwin_composite/; revision=610613
