Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-pcd!hpcvlx!harry
From: harry@hpcvlx.cv.hp.com (Harry Phinney)
Newsgroups: comp.windows.x
Subject: Re: Backing Store on DEC station and HP9000
Message-ID: <100920132@hpcvlx.cv.hp.com>
Date: 20 Nov 89 02:17:30 GMT
References: <213@ide.UUCP>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 12

> The HP 9000 pops the window correctly, it appears with all of the obscured
> pixels visible and then it issues an expose event so that everything gets
> redrawn anyway.
> Alan Michels

Unfortunately, this is a known bug in our current server.  The
backing store is properly maintained, but the expose event does indeed
get sent.  A (sleazy) workaround is to do a GetWindowAttributes upon
receipt of an expose, and see if backingStore is still set on the
window.  If so, assume that the data's really there.

Harry Phinney