Merge from origin/emacs-26

643df63 (origin/emacs-26) Avoid byte-compiler warning in em-rebind.el
d0eca49 ; * doc/emacs/mark.texi (Disabled Transient Mark): Fix last c...
af80b10 Improve indexing of 'C-SPC C-SPC'
89a7301 ; * doc/lispref/internals.texi (Writing Dynamic Modules): Fix...
a108eaa Fix bug with precious entries in Gnus registry
ce8b458 Document in the ELisp manual how to write loadable modules
a7ebc6b dired-do-shell-command: Notify users after abort the command

# Conflicts:
#	lisp/registry.el

diff --cc doc/lispref/elisp.texi
Simple merge

diff --cc doc/lispref/internals.texi
Simple merge

diff --cc doc/lispref/loading.texi
Simple merge

diff --cc doc/misc/gnus.texi
Simple merge

diff --cc lisp/dired-aux.el
Simple merge

diff --cc lisp/registry.el
index 4928dd9b2023d2aab88cf35e40ed22b51face29f,04f3e7b974c0dfba05707a995b0a1b5c9cd6f441..c3184a820f34cf9871b9d8e65c479be2529a7375
--- 1/lisp/registry.el
--- 2/lisp/registry.el
+++ b/lisp/registry.el
@@@ -358,7 -358,7 +358,7 @@@ return LIMIT such candidates.  If SORTF
  entries first and return candidates from beginning of list."
    (let* ((precious (oref db precious))
         (precious-p (lambda (entry-key)
-                      (cdr (memq (car-safe entry-key) precious))))
 -                     (memq (car entry-key) precious)))
++                     (memq (car-safe entry-key) precious)))
         (data (oref db data))
         (candidates (cl-loop for k being the hash-keys of data
                              using (hash-values v)