The first signal used between EffectsHandler and Effects.
The signal is actually emitted by the EffectsHandlerImpl and only
the interested effects connect to this signal.
EffectsHandlerImpl itself is also notified by a signal from Workspace,
allowing to remove one of the many if (effects) checks.
The cube starts to rotate before the desktop switches due to active desktop border change. This gives the impression that you drag the cube by moving the window. Of course option is only useful when switching desktop on screen edge is enabled and so this feature is disabled by default.
svn path=/trunk/KDE/kdebase/workspace/; revision=1072640
