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From: Ulrich Neumerkel <ulrich@complang.tuwien.ac.at>
Newsgroups: gmane.emacs.devel
Subject: Re: "Position Parameters" in lispref/frames.texi
Date: Tue, 22 Jan 2008 07:37:37 +0100
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> Thank you; making that changes also fixes it for me (Window Maker on                                                  > GNU/Linux). This change was introduced 2006-06-16, with the log entry                                                 > "Extensive changes to make frame positioning deterministic under X.",                                                 >which doesn't tell me anything.

! The intention seems to be to encode with negative numbers something
else (see the comment just before x_set_offset:  ...
It is -1 when calling from x_set_frame_parameters, ...

So there is some intention behind it - probably something more general
must be fixed to solve this in general.