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bug#40794: 26.3; HTML entities ☆ and ★ (inter alia) are not p

From: Tim Landscheidt
Subject: bug#40794: 26.3; HTML entities ☆ and ★ (inter alia) are not parsed by libxml-parse-html-region
Date: Thu, 23 Apr 2020 13:24:12 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) 
(Prologue: This bug showed up in the "ALT" attribute of an
"IMG" element of an HTML mail in Gnus.  I am reasonably cer-
tain that this stems from libxml-parse-html-region and
should be fixed there, but there may be more prudent solu-
tions.)

With GNU Emacs 26.3 on Fedora:

| ELISP> (with-temp-buffer
|          (insert "<!DOCTYPE html>
| <html lang=\"en\">
| <head><title>Title</title></head>
| <body>
|   <p>Hello world</p>
|   <p>&auml;</p>
|   <p>&star;</p>
|   <p>&starf;</p>
| </body>
| </html>")
|          (libxml-parse-html-region (point-min) (point-max)))
| (html
|  ((lang . "en"))
|  (head nil
|        (title nil "Title"))
|  (body nil "\n  "
|        (p nil "Hello world")
|        "\n  "
|        (p nil "ä")
|        "\n  "
|        (p nil "&star;")
|        "\n  "
|        (p nil "&starf;")
|        "\n"))

| ELISP>

These should instead yield "ä" (228), "☆" (9734) and
"★" (9733).

lisp/leim/quail/sgml-input.el seems to contain the necessary
data for &star; and &starf; that could probably be fed to
libxml.
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