Path: utzoo!utgpu!watserv1!watmath!att!rutgers!apple!agate!shelby!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: pointer button specific processing
Message-ID: <9009011443.AA14449@expo.lcs.mit.edu>
Date: 1 Sep 90 14:43:39 GMT
References: <3371@syma.sussex.ac.uk>
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
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    why does it do this?

Because it was felt that applications almost always want to see the
corresponding button release, even if it occurs outside their window.
Failing to receive the button release was a common cause of bugs in
X10 days.  In retrospect, explicit control over this behaviour would
probably have been better, but such is life.