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

From: Paul Eggert
Subject: bug#26396: 25.1; char-displayable-p on a latin1 tty
Date: Mon, 17 Apr 2017 11:08:09 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0

On 04/17/2017 01:08 AM, Eli Zaretskii wrote:

My reading of the code is that at least some of these unsupported
characters will NOT be displayed as \uNNNNN, but rather as some
fallback glyph produced by the console itself, which is not what we
want, I think.
Yes, that's what happens. It's not ideal, and perhaps it could be improved. (I hope by someone else....)

There are similar display problems even in unibyte mode on the Linux console. Sometimes a character above U+00FF is displayed as '\uNNNN', sometimes as '?', sometimes the same character is displayed in different forms depending on what else is in the buffer, and I don't know why. (And likewise, I don't want to spend time worrying about this, as the 1990s are long gone....)

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