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bug#17975: 24.3.92; assertion failure deleting frames with varying names

From: Dmitry Antipov
Subject: bug#17975: 24.3.92; assertion failure deleting frames with varying names for the same display (and, using multiple X11 connections in that case too)
Date: Mon, 14 Jul 2014 11:23:36 +0400

On 07/14/2014 09:13 AM, Ken Raeburn wrote:

Would it not be enough to do a similar canonicalization of $DISPLAY
and the make-frame-on-display argument, if that was enough in emacsclient?

Probably no - the following example also crashes:

./src/emacs -Q --eval '(let ((f (selected-frame))) (make-frame-on-display 
":1.0") (delete-frame f))'

where :1.0 is Xnest running on the same machine.

I don't think it would be practical for me to run a patched X11 at work. I was 
going to run a test at home,
but my home GNU/Linux setup (Debian "wheezy" distro) seems to have a newer X11 
package (1.5.0, with patches
including ximcp/imLcPrs.c and imTrX.c but not imInsClbk.c) than the one at work (Ubuntu 
"precise" distro, with patches), and I haven't been able to reproduce the problem yet.

I tried both stock Fedora 20 libX11-1.6.1 and 1.6.2 recompiled from rawhide,
and was able to reproduce with both.

This mess raises up an old question: should Emacs treat 
localhost:0/unix:0/:0.0/:0 etc.
like the same display and has the only connection for all of them? It was 
discussed a long
time ago, at least at 


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