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From: rws@EXPO.LCS.MIT.EDU
Newsgroups: comp.windows.x
Subject: Re: XCheckMaskEvent
Message-ID: <8907061310.AA11730@expire.lcs.mit.edu>
Date: 6 Jul 89 13:10:19 GMT
References: <8907052219.AA03843@s1.msi.umn.edu>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
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    I seem to be having a problem getting XCheckMaskEvent to receive
    SelectionRequest events. Since these events cannot be masked (I tried
    setting the mask to "0xFFFFFFFF" to no avail) it shouldn't be a masking
    problem.

Wake up.  These events cannot be selected for, so there is no mask, so why
do you think you can specify a mask for them?  Use XCheckTypedEvent instead.