Use transparency for minimized windows in the fade-in and fade-out phases (when
the effect is not fully active yet)
svn path=/branches/work/kwin_composite/; revision=626829
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
Another window can then be activated by clicking on it.
Also add interpolate() utility function to Effect
svn path=/branches/work/kwin_composite/; revision=622634
