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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Tabs
Date: Tue, 08 Oct 2019 19:18:40 +0300
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Cc: michael_heerdegen@web.de, juri@linkov.net, emacs-devel@gnu.org
To: Ergus <spacibba@aol.com>
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> Date: Tue, 8 Oct 2019 18:00:38 +0200
> From: Ergus <spacibba@aol.com>
> Cc: michael_heerdegen@web.de, emacs-devel@gnu.org, juri@linkov.net
> 
> >Please show an exact recipe starting from "emacs -Q".
> 
> 
> emacs -Q
> 
> C-x 6 f file RET
> 
> The file is opened but it not visible tabs.

If you run this under GDB with a breakpoint on
x_change_tab_bar_height, do you see that function called after you
press RET?  If so, please show the backtrace from the call.  I expect
it to be called twice, so please show both backtraces.