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From: rws@EXPO.LCS.MIT.EDU
Newsgroups: comp.windows.x
Subject: Re: How to track window size changes (X11R3 *without* the Toolkit)
Message-ID: <8905261855.AA02541@expire.lcs.mit.edu>
Date: 26 May 89 18:55:48 GMT
References: <1228@irisa.UUCP>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
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	XSelectInput(dpy, win, ExposureMask | ResizeRedirectMask)

You want StructureNotifyMask, not ResizeRedirectMask.  Selecting for
ResizeRedirectMask will tend to prevent the WM from resizing your window,
unless your program handles the negotiation.  To get the new dimensions,
you should track the ConfigureNotify events that arrive.