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

From: Kevin Ryde
Subject: bug#26396: 25.1; char-displayable-p on a latin1 tty
Date: Fri, 14 Apr 2017 13:01:52 +1000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Paul Eggert <address@hidden> writes:
> It depends on whether the console is in UTF-8 mode.  If so, send UTF-8;
> if not, send a byte that is transformed according to the current
> mapping table into a Unicode value.  I hope we don't need to bother
> with the latter possibility.

The latter is just terminal-coding-system though is it?, which is what
happens now.  Would char-displayable-p always check encodable and then
ponder what further the kernel ioctls can say about viewable glphs.

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