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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: branch master segfault (2019-02-05)
Date: Wed, 06 Feb 2019 17:44:25 +0200
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Cc: emacs-devel@gnu.org
To: Philippe Vaucher <philippe.vaucher@gmail.com>
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	(message from Philippe Vaucher on Wed, 6 Feb 2019 10:30:06 +0100)
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> From: Philippe Vaucher <philippe.vaucher@gmail.com>
> Date: Wed, 6 Feb 2019 10:30:06 +0100
> 
> Okay, Emacs works if I in term.c:753 if I use this:
> 
> ```
> coding = FRAME_TERMINAL_CODING (f);
> ```
> 
> instead of:
> 
> ```
> coding = (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_ENCODING_MASK ?
> FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
> ```
> 
> I know docker allocates a "pseudo TTY", so probably that there's a misdetection happening here.

No, it isn't misdetection.  The problem is that safe_terminal_coding
is not set up.