Newsgroups: comp.windows.x
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!hellgate.utah.edu!ug.utah.edu!dmcallis
From: dmcallis%ug.utah.edu@cs.utah.edu (Dave McAllister)
Subject: Re: twm problems on Ardent
Date: Mon, 16-Oct-89 20:11:28 MDT
Message-ID: <1989Oct16.201129.25012@hellgate.utah.edu>
Keywords: twm menus, lost pointer?, Ardent Titan II
Organization: University of Utah CS Dept
References: <220@opusc.CS.SCAROLINA.EDU>

<problem with twm: popup windows go blank>

Yes. I've experienced your problem several times. We use twm at Evans &
Sutherland (where it was written), and I started having things written in my
popup windows during an outbreak prank programs such as crabs, termites,
taunting faces, and other programs that do Sun graphics on the PixRect level.
If I had a popup window up and one of these programs drew something across it
it would be there the next time I pulled up that window. So apparently the
popup window bitmap is mapped back from the part of the screen where it was
displayed. I imagine since the Ardent II's presumably use different low-
level pixel calls they zero the window when it is undrawn, accounting for
the different behavior on different systems.
    I'm sorry I'm not more knowledgable about this stuff (I've only used Unix
for 3 months), but hopefully this will point you closer to the source of the
problem.

Good luck!
Dave