PATCH: xlib double-buffering support

[graydon hoare]

"Scott Gilbertson" <scottg@mantatest.com> writes:

> It's mostly confined to the xlib peer code, but also includes changes to
> gnu/awt/j2d/IntegerGraphicsState.java and java/awt/Component.java
> 
> BTW I think Graydon's stuff relies on it (see
> http://gcc.gnu.org/ml/java-patches/2003-q3/msg00129.html).

relies on the Component.java portion, yeah. doesn't know anything
about the j2d/* or xlib/* stuff.

-graydon