Instead of scheduling and gathering the Workspace::addRepaint calls at the end of the main loop
we directly emit the signal which ends up in a call to addRepaint. The compositeTimer assures
that the higher number of scheduled repaints are executed in the same rendering pass.
in case we need it again.
This should improve performance with drivers where creating pixmaps is
expensive.
svn path=/trunk/KDE/kdebase/workspace/; revision=1104069
