Comment 2 for bug 916770

StacktraceTop:
 CompWindow::id (this=0xb3e415f0) at /build/buildd/compiz-0.9.6+bzr20110929/src/window.cpp:5590
 getPaintMask (this=<optimized out>) at /build/buildd/unity-5.0.0/plugins/unityshell/src/compizminimizedwindowhandler.h:276
 unity::UnityWindow::glPaint (this=0xb3ece978, attrib=..., matrix=..., region=..., mask=2) at /build/buildd/unity-5.0.0/plugins/unityshell/src/unityshell.cpp:1685
 GLWindow::glPaint (this=0xb3e41528, attrib=..., transform=..., region=..., mask=2) at /build/buildd/compiz-0.9.6+bzr20110929/plugins/opengl/src/paint.cpp:1223
 PrivateGLScreen::paintOutputRegion (this=0x8ada378, transform=..., region=..., output=0x8aa0100, mask=11) at /build/buildd/compiz-0.9.6+bzr20110929/plugins/opengl/src/paint.cpp:282