Bug#641076: Don't fade screen on remote X displays

[Daniel Richard G.]

Package: libgksu2-0
Version: 2.0.13~pre1-4
Tags: patch

If your desktop is on a remote X display, libgksu's fancy fade-out
becomes more like a few-seconds-long freeze, after which the screen
instantly darkens and the authentication dialog appears. The fade-in
afterwards is similarly clunktastic.

This is a patch I've had kicking around for a while, and would have
submitted to the upstream, if the upstream maintainer hadn't apparently
ceased all work on this project in late 2009.

The patch implements a simple test to check whether the screen is local
or not. The screen_is_local() function might need updating to support
non-X displays; I haven't any experience with those.
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