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Display of undisplayable characters: \U01F3A8 instead of diamond

From: Richard Stallman
Subject: Display of undisplayable characters: \U01F3A8 instead of diamond
Date: Thu, 25 Aug 2022 23:33:57 -0400

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The text-based Linux console is unable to display many Unicode
characters.  In Emacs 29, display of undisplayable characters has
changed.  It used to show them with a diamond.  Now it shows the
unicode character code as hex, preceded by \U.

I find that change quite inconvenient.  It makes the text harder to
read.  Showing the codes does no good, since I don't know these codes,
not even for characters I am familiar with.  To find out what
character a code represents, I have to use C-u C-x =, just as I did

I last built the sources in May.  Has this changed in a significant
way since then?

I could not find, in NEWS, anything about this change -- it ought to
be in NEWS .  Nor a way to go back to the old
behavior.  Is there a way?  If not, would people please create a way?

As a separate question, do users generally like this change?
Would it be better to return to the old diamond method as the default?

Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

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