bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications

[Eli Zaretskii]

> From: Matthew Leach <matthew@mattleach.net>
> Date: Mon, 30 Sep 2019 20:59:04 +0100
> 
> The attached patch removes the exporting of the LINES and COLUMNS
> environment variables in term-mode.  Exporting these variables causes
> issues for ncurses applications.  For example, when running:
> 
> emacs -Q
> M-x term
> <ret> (to select /bin/bash)
> htop (to run htop)
> 
> and resizing the window (especially making it smaller) can make the
> program impossible to read.

Thanks, but I don't think we can make this change unconditionally,
because not all applications that heed LINES and COLUMNS use ncurses.
I wonder if we can do better than just providing a defcustom.