Comment 2 for bug 980160

StacktraceTop:
 g_assertion_message (domain=0xb5ca7873 "Gdk", file=0xb5cac35c "/build/buildd/gtk+2.0-2.24.10/gdk/gdkregion-generic.c", line=1110, func=0xb5cac4d1 "miUnionNonO", message=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gtestutils.c:1861
 g_assertion_message_expr (domain=0xb5ca7873 "Gdk", file=0xb5cac35c "/build/buildd/gtk+2.0-2.24.10/gdk/gdkregion-generic.c", line=1110, func=0xb5cac4d1 "miUnionNonO", expr=0xb5cac29e "y1 < y2") at /build/buildd/glib2.0-2.32.0/./glib/gtestutils.c:1872
 miUnionNonO (pReg=0xa453cf00, r=<optimized out>, rEnd=0x9fd37f0, y1=40, y2=5) at /build/buildd/gtk+2.0-2.24.10/gdk/gdkregion-generic.c:1114
 miRegionOp (newReg=0xa453cf00, reg1=<optimized out>, reg2=0xa45406c0, overlapFn=0xb5c5f430 <miUnionO>, nonOverlap1Fn=0xb5c5f270 <miUnionNonO>, nonOverlap2Fn=0xb5c5f270 <miUnionNonO>) at /build/buildd/gtk+2.0-2.24.10/gdk/gdkregion-generic.c:942
 IA__gdk_region_union (source2=0xa45406c0, source1=0xa453cf00) at /build/buildd/gtk+2.0-2.24.10/gdk/gdkregion-generic.c:1266