Path: utzoo!attcan!uunet!husc6!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: graphics in a viewport
Message-ID: <8811152107.AA14887@EXPO.LCS.MIT.EDU>
Date: 15 Nov 88 21:07:13 GMT
References: <8811152003.AA11042@uc.msc.umn.edu>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 14


	If you do graphics in the viewport 
	and then scroll around, you lose the graphics that have
	been done. You also can't do graphics off of the displayed 
	viewport (almost a necessity).

If you want the graphics to be retained, you need to enable backing-store
for the widget (and any inferiors, sorry) that you place inside the viewport
that you want the graphics retained for.  Alternatively, you can try
enabling save-unders on just the viewport window, but some implementations of
save-unders may discard graphics to save-undered regions.

You also need to have a server (like those in R3) that support backing-store
or save-unders.