[PATCH xserver] fb: Check whether the window is enabled directly

[Adam Jackson]

On Tue, 2017-09-12 at 17:10 -0400, Adam Jackson wrote:
> ... instead of its root window. Xwayland's rootless mode empties the
> root window border clip since its root window has no storage, but
> redirected windows (the only kind it can show) will have a non-empty
> border clip anyway, cf. the #ifdef COMPOSITE in miComputeClips. With
> this change, non-glamor Xwayland's GetImage actually works.

Note that I've merely asserted this to be true, not tested it.

- ajax