From 6596b5541dd147749e2091953ac77bcd73c8d404 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Mattias=20Engdeg=C3=A5rd?= <mattiase@acm.org>
Date: Thu, 10 Dec 2020 10:57:16 +0100
Subject: [PATCH] =?utf8?q?Fupcase=20no=20longer=20maps=20=3F=C3=9F=20to=20?=
 =?utf8?q?itself=20(bug#11309)?=
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* test/src/casefiddle-tests.el (casefiddle-tests-char-casing):
(upcase ?ß) now returns ?ẞ (U+7838), partly for technical reasons but
the previous behaviour was arbitrary and arguably less useful.
Correct upcasing of ß is normally SS, which is what Fupcase returns if
given a string, or (for special purposes) ẞ.
---
 test/src/casefiddle-tests.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/src/casefiddle-tests.el b/test/src/casefiddle-tests.el
index 7abb79eadde..3eba4cfd78b 100644
--- a/test/src/casefiddle-tests.el
+++ b/test/src/casefiddle-tests.el
@@ -247,7 +247,8 @@
   ;;             input upcase downcase [titlecase]
   (dolist (test '((?a ?A ?a) (?A ?A ?a)
                   (?ł ?Ł ?ł) (?Ł ?Ł ?ł)
-                  (?ß ?ß ?ß) (?ẞ ?ẞ ?ß)
+                  ;; We char-upcase ß to ẞ; see bug #11309.
+                  (?ß ?ẞ ?ß) (?ẞ ?ẞ ?ß)
                   (?ⅷ ?Ⅷ ?ⅷ) (?Ⅷ ?Ⅷ ?ⅷ)
                   (?DŽ ?DŽ ?dž ?Dž) (?Dž ?DŽ ?dž ?Dž) (?dž ?DŽ ?dž ?Dž)))
     (let ((ch (car test))
-- 
2.39.2