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From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: Grab puzzler
Message-ID: <8912140103.AA27020@expire.lcs.mit.edu>
Date: 14 Dec 89 01:03:26 GMT
References: <2838586831-1909703@RIGI>
Sender: root@athena.mit.edu (Wizard A. Root)
Organization: The Internet
Lines: 15


    The event masks of both B
    and M have previously been set to select for EnterWindow.

For a grab with owner-events False, what matters is the event-mask used
in the GrabButton call, not the normal event-mask of the window.  Does
that mask have enter/leave selected for?

    Therefore, when the user moves the pointer (with the pointer button still
    pressed) off B and onto M, an EnterWindow event should be reported to B,
    i.e.  as a result of entering M.

Hmm, nope.  You'll get a Leave event when you leave B, but enter/leave events
on other windows aren't forwarded to B.  The protocol document probably isn't
very clear on this point.