Merge from origin/emacs-28

b0d64be0bc (origin/emacs-28) Improve some NEWS entries
7fde84e881 Improve documentation of syntax-ppss-context slightly
5ecbed01b2 ; * test/lisp/mh-e/mh-utils-tests.el: Update macro declara...
168665da59 Move some xwidget entries
efde024361 time-stamp-tests: improvements to test macros
06c944cff1 Fix rfc6068-parse-mailto-url autoload
9b6b5e37ef Regexp-quote github domains in bug-reference
1f6cdeb12c Ensure valid end/beginning lines in message-mark-inserted-...
9b46150ab0 * etc/NEWS: Improve 'repeat-mode' entry.
9c37b812da ; * lisp/repeat.el (repeat-mode): Fix docstring typo.
caf87d80fa * lisp/repeat.el (repeat-keep-prefix): Expand description.
24083c8d13 * lisp/net/eww.el (eww-retrieve-command): Add :tag.
cf7d8fb1d7 Add description of cards to etc/refcards/README
d2849cc645 Fix 'calculate-lisp-indent' when "[" starts containing sex...
2a0a368ddc Fix typo in doc/emacs/anti.texi
9529e1d2fb Update doc of Edebug specification for macros
5bc522b4f4 ; * lisp/simple.el (kill-region): A better fix for bug#51320.
ee6bdd6eef Fix non-interactive behavior of 'kill-region'
2b7655ca0e ; More accurate doc string for 'tab-bar-format'
2841e26744 * test/lisp/dabbrev-tests.el: Use 'kbd' for readable keys.
1cdb4d2077 * lisp/menu-bar.el (menu-bar-keymap): Add optional arg KEY...

# Conflicts:
#	etc/NEWS
#	lisp/progmodes/bug-reference.el

lisp/emacs-lisp/lisp-mode.el

@@ -1078,10 +1078,11 @@ is the buffer position of the start of the containing expression."
 		       ;; Handle prefix characters and whitespace
 		       ;; following an open paren.  (Bug#1012)
                        (backward-prefix-chars)
-                       (while (not (or (looking-back "^[ \t]*\\|([ \t]+"
-                                                      (line-beginning-position))
-                                       (and containing-sexp
-                                            (>= (1+ containing-sexp) (point)))))
+                       (while (not (save-excursion
+                                     (skip-chars-backward " \t")
+                                     (or (= (point) (line-beginning-position))
+                                         (and containing-sexp
+                                              (= (point) (1+ containing-sexp))))))
                          (forward-sexp -1)
                          (backward-prefix-chars))
                        (setq calculate-lisp-indent-last-sexp (point)))