Make the value nil in text-quoting-style mean what it does in Emacs 25.

This is a partial reversion of yesterday's commit by the same author, which
changed the meaning of nil and introduced the new value t.

* src/doc.c (text_quoting_style, text-quoting-style)
(internal--text-quoting-flag): Revert yesterday's changes.

* lisp/cus-start.el: (top level): Amend the entry for text-quoting-style.

* etc/NEWS: Amend the entry for text-quoting-style.

* doc/lispref/control.texi (Signalling Errors)
* doc/lispref/display.texi (Displaying Messages)
* doc/lispref/strings.texi (Formatting Strings): Bind text-quoting-style to
grave rather than nil to inhibit translation of quotes.

* doc/lispref/help.texi (Keys in Documentation): Revert the description of the
proposed new default, t.

1 files changed, 2 insertions, 3 deletions

diff --git a/lisp/cus-start.el b/lisp/cus-start.el
index f5e1431f6bb..a5ec223fe51 100644
--- a/lisp/cus-start.el
+++ b/lisp/cus-start.el
@@ -226,11 +226,10 @@ Leaving \"Default\" unchecked is equivalent with specifying a default of
              ;; doc.c
              (text-quoting-style display
                                  (choice
-                                  (const :tag "No translation" nil)
-                                  (const :tag "Prefer \\=‘curved\\=’ quotes, if possible" t)
+                                  (const :tag "Prefer \\=‘curved\\=’ quotes, if possible" nil)
                                   (const :tag "\\=‘Curved\\=’ quotes" curved)
                                   (const :tag "\\='Straight\\=' quotes" straight)
-                                  (const :tag "\\=`Grave\\=' quotes" grave)))
+                                  (const :tag "\\=`Grave\\=' quotes (no translation)" grave)))
 
              ;; dosfns.c
              (dos-display-scancodes display boolean)