[cairo] [1.10.0] Win32 redrawing issues (regression?)

[Cxx Joe]

It doesn't seem like anyone is actually reading this, but what I
described in my earlier post definitely is the source of the bug. If I
change rect.y in _composite_rectangle (through the debugger), it
starts working... I have absolutely no clue about cairo_traps_t, but
I'll still try to come with a patch, maybe that will get you guys
talking (I'd also offer alcohol, but that's a bit hard to pour down
the wire).

Joe