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From: info-mac@uw-beaver (info-mac)
Newsgroups: fa.info-mac
Subject: Re: Update Events
Message-ID: <2043@uw-beaver>
Date: Fri, 26-Oct-84 12:44:59 EDT
Article-I.D.: uw-beave.2043
Posted: Fri Oct 26 12:44:59 1984
Date-Received: Sat, 27-Oct-84 04:13:24 EDT
Sender: daemon@uw-beave
Organization: U of Washington Computer Science
Lines: 12

From: John W. Peterson <JW-Peterson@UTAH-20.ARPA>
Ah yes, that IS a real gotcha.  It's also worth keeping in mind the same
holds true for activate events as well, you MUST set the port before
drawing anything.  

The place where I found this out the hard way was when my code closed a 
desk accessory and forgot to reset the port when the activate event 
occured for my window.  It would use the old accessory's (now disposed) 
port, and the window manager would try and clip the drawing to the disposed 
port's region.  This sent quickdraw into never-never land because the disposed
region was now garbage...
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