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bug#31376: 26.0.50; print-charset-text-property not honored

From: Noam Postavsky
Subject: bug#31376: 26.0.50; print-charset-text-property not honored
Date: Mon, 14 May 2018 19:15:30 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

> This seems to rely on some relationship between what char-charset
> returns and the car of charset-list, is that right?

The idea is to take the first if it's not eq to what char-charset
returns, or the second otherwise (on the assumption that it's different
from the first).  Perhaps clearer if I use cl-find:

    (defun print-tests--prints-with-charset-p (ch odd-charset)
      "Return t if `prin1-to-string' prints CH with the `charset' property.
    CH is propertized with a `charset' value according to
    ODD-CHARSET: if nil, then use the one returned by `char-charset',
    otherwise, use a different charset."
         (propertize (string ch)
                     (if odd-charset
                         (cl-find (char-charset ch) charset-list :test-not #'eq)
                       (char-charset ch)))))))

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