bug#26396: 25.1; char-displayable-p on a latin1 tty

[Paul Eggert]

On 04/13/2017 03:07 PM, Richard Stallman wrote:
>    > Wouldn't it be better if Emacs ignored terminal-coding-system when the 
> output
>    > device is a Linux console and Emacs therefore knows exactly which 
> characters the
>    > console can display?
>
> Does Emacs always know for certain?
If Emacs is attached directly to a console, yes. There's already some 
code that does this, by using Linux-specific syscalls.

> What if it is talking to that console via ssh?

Then Emacs won't know, and will fall back on generic terminal code. 
However, the case that prompted this thread is where part of Emacs does 
know and part does not, and the mismatch causes a problem. I'm proposing 
that different parts of Emacs treat Linux consoles more consistently.