We need to explicitly select for PropertyChangeMask, so that we see

PropertyNotify events for effects. This fixes the task bar tooltip
showing the preview for the first item hovered even when you move to
another item.

svn path=/trunk/KDE/kdebase/workspace/; revision=776040

unmanaged.cpp

@@ -53,7 +53,7 @@ bool Unmanaged::track( Window w )
         return false;
         }
     setWindowHandles( w, w ); // the window is also the frame
-    XSelectInput( display(), w, attr.your_event_mask | StructureNotifyMask );
+    XSelectInput( display(), w, attr.your_event_mask | StructureNotifyMask | PropertyChangeMask);
     geom = QRect( attr.x, attr.y, attr.width, attr.height );
     vis = attr.visual;
     bit_depth = attr.depth;