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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: Tue, 18 Apr 2017 10:49:37 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0

On 04/17/2017 11:32 AM, Eli Zaretskii wrote:
Can you show an example of a character displayed in different forms
depending on buffer contents?  I'd like to look what the code does and why.

In master on the Linux console in non-UTF-8 mode and with a unibyte en_US locale, if I run 'emacs -Q' and type 'C-x 8 RET 100 RET C-x 8 RET 200 RET' the screen looks like this:


If I then type 'C-x 8 RET 300 RET', the '\u0200' magically changes to '?' and another '?' is appended, so that the screen then looks like this:


Presumably this is some sort of combining-character thing. However, if the intent is to present a combined character, shouldn't the character be displayed as a single '?', to better mimic the single glyph you'd see on an X display?

By the way, the '?'s look like ordinary question marks; they are not highlighted, as the \u0100 is. Shouldn't they be highlighted somehow? And while I have your ear, why is U+0700 SYRIAC END OF PARAGRAPH displayed as an ordinary '?' while U+0500 CYRILLIC CAPITAL LETTER KOMI DE is displayed as a highlighted '\u0500'?

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