backing store, and documentation

[Raul Miller <moth@debian.org>]

I just ran into something rather odd:  I have an application which
requires backing store.  4.0.1 has backing store off by default.

You can turn on backing store by giving the x server the +bs option,
or by putting
	option "backingstore"
in the Screen section of XF86Config.

This XF86Config option is undocumented, and the Xserver man page only
documents the -bs option -- it doesn't mention the use of the "+" sign,
nor does it mention that backing store is turned off by default.

I don't know which is right -- the documentation or the implementation.

-- 
Raul