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From: dshr@eng.sun.COM (David Rosenthal)
Newsgroups: comp.windows.x
Subject: Re: BackingStore Always (was:PC X servers / backing store)
Message-ID: <9103070625.AA04108@devnull.Eng.Sun.COM>
Date: 7 Mar 91 06:24:40 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 18

> 	The problem was that our server is capable of setting BackingStore
> to Always as a default. (Setting the default to something other than NotUseful
> is a way of invoking backing store for clients that do not set the attribute
> themselves)
> 
Forcing backing-store=Always on clients which did not request it
is *not* permissible behaviour from an X server.  As Bob Scheifler
wrote recently:

> Note that if you
> mean you are using some kind of server config option to force Always on
> unsuspecting clients, this is contrary to the specification, so you
> shouldn't be surprised if clients break.  WhenMapped is the strongest
> implicit default you can force on clients.
> 
Caveat emptor.

	David.