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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Tabs
Date: Mon, 07 Oct 2019 19:05:23 +0300
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Cc: michael_heerdegen@web.de, emacs-devel@gnu.org
To: Juri Linkov <juri@linkov.net>
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> From: Juri Linkov <juri@linkov.net>
> Cc: michael_heerdegen@web.de,  emacs-devel@gnu.org
> Date: Sun, 06 Oct 2019 22:58:28 +0300
> 
> > OK, can you set a watchpoint on the frame's garbaged flag, and show me
> > both C and Lisp backtraces each time the flag is set or reset while we
> > loop for two iterations there?
> 
> It's very strange but a watchpoint is hit only on setting flag to false:

Hmm... I guess that's the problem, then.

Please try the latest master, I hope this is now fixed.