paintTransformedScreen() is broken, disable its usage.

svn path=/trunk/KDE/kdebase/workspace/; revision=805050

COMPOSITE_TODO

@@ -155,6 +155,7 @@ XRender TODO
 
 + SceneXrender::paintTransformedScreen() doesn't handle properly extending of painted area
     in window's pre-paint - see the transformedShape() comment
+    - and currently seems to be generally broken
 
 
 Effects framework TODO

scene_xrender.cpp

@@ -183,13 +183,14 @@ void SceneXrender::paint( QRegion damage, ToplevelList toplevels )
 void SceneXrender::paintGenericScreen( int mask, ScreenPaintData data )
     {
     screen_paint = data; // save, transformations will be done when painting windows
-    if( false ) // TODO never needed?
+    if( true ) // as long as paintTransformedScreen() doesn't work properly
         Scene::paintGenericScreen( mask, data );
     else
         paintTransformedScreen( mask );
     }
 
 /*
+ TODO currently broken
  Try to do optimized painting even with transformations. Since only scaling
  and translation are supported by the painting code, clipping can be done
  manually to avoid having to paint everything in every pass. Whole screen