From 0feb6733d4bea5f360abc3f64bfc5b9b29087c48 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Fri, 27 Jul 2018 09:47:37 +0300
Subject: Display raw bytes as belonging to 'eight-bit' charset

* lisp/descr-text.el (describe-char):
* lisp/simple.el (what-cursor-position): Display characters in the
range #x3FFF80..#x3FFF9F as belonging to charset 'eight-bit', not
'tis620-2533'.
* lisp/international/mule-diag.el (describe-character-set):
Improve description of :supplementary-p.
---
 lisp/descr-text.el              | 6 ++++++
 lisp/international/mule-diag.el | 3 ++-
 lisp/simple.el                  | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/lisp/descr-text.el b/lisp/descr-text.el
index ddd7d801d2a..00b40826f48 100644
--- a/lisp/descr-text.el
+++ b/lisp/descr-text.el
@@ -404,6 +404,12 @@ relevant to POS."
            (charset (if eight-bit-p 'eight-bit
                       (or (get-text-property pos 'charset)
                           (char-charset char))))
+           ;; TIS620.2533 overlaps eight-bit-control, but we want to
+           ;; show eight-bit for raw bytes, not some obscure character
+           ;; set no one heard of.
+           (charset (if (eq charset 'tis620-2533)
+                        'eight-bit
+                      charset))
            (composition (find-composition pos nil nil t))
            (component-chars nil)
            (display-table (or (window-display-table)
diff --git a/lisp/international/mule-diag.el b/lisp/international/mule-diag.el
index 7e225607a5a..b5a78338f63 100644
--- a/lisp/international/mule-diag.el
+++ b/lisp/international/mule-diag.el
@@ -355,7 +355,8 @@ meanings of these arguments."
 		     (:iso-revision-number "ISO revision number: "
 					   number-to-string)
 		     (:supplementary-p
-		      "Used only as a parent of some other charset." nil)))
+		      "Used only as a parent or a subset of some other charset,
+or provided just for backward compatibility." nil)))
 	(let ((val (get-charset-property charset (car elt))))
 	  (when val
 	    (if (cadr elt) (insert (cadr elt)))
diff --git a/lisp/simple.el b/lisp/simple.el
index 8b183469f8a..90fea11dc1b 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -1353,7 +1353,7 @@ in *Help* buffer.  See also the command `describe-char'."
 	(if (or (not coding)
 		(eq (coding-system-type coding) t))
 	    (setq coding (default-value 'buffer-file-coding-system)))
-	(if (eq (char-charset char) 'eight-bit)
+	(if (and (>= char #x3fff80) (<= char #x3fffff))
 	    (setq encoding-msg
 		  (format "(%d, #o%o, #x%x, raw-byte)" char char char))
 	  ;; Check if the character is displayed with some `display'
-- 
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