[cairo] XDBE

[mental at rydia.net]

Quoting Bill Spitzak <spitzak at d2.com>:

> Having used it quite a bit, I am having no trouble. The only real
> bug is that if you resize a window, it sometimes swaps in the
> black/garbage from the backing buffer.

That sounds like the bug I vaguely remember.  Issues with
black/garbage showing up, so the result was visually worse than not
using the backing store at all.

-mental