* lisp/emacs-lisp/rmc.el (rmc--add-key-description): Improve
formatting of key missing in the description. Use face help-key-name
on terminals that can't display underline.
* lisp/emacs-lisp/rmc.el (rmc--add-key-description): Improve display
of the keys TAB, RET, SPC, DEL, and ESC. This fixes a bug where " "
was highlighted in the description in a confusing way.
* test/lisp/emacs-lisp/rmc-tests.el
(test-rmc--add-key-description)
(test-rmc--add-key-description/with-attributes): Update tests for the
above change.
* lisp/emacs-lisp/rmc.el (rmc--show-help): Factor out new function
from read-multiple-choice.
(read-multiple-choice): Add new optional argument show-help.
* doc/lispref/commands.texi (Reading One Event): Document above new
optional argument.
* lisp/emacs-lisp/rmc.el (rmc--add-key-description): Add face
property also when key is not in the name string.
* test/lisp/emacs-lisp/rmc-tests.el
(test-rmc--add-key-description/with-attributes)
(test-rmc--add-key-description/non-graphical-display): Update tests.
* lisp/emacs-lisp/rmc.el (rmc--add-key-description): Factor out
new function from...
(read-multiple-choice): ...here.
* test/lisp/emacs-lisp/rmc-tests.el (test-rmc--add-key-description)
(test-rmc--add-key-description/with-attributes)
(test-rmc--add-key-description/non-graphical-display): New tests.
* lisp/emacs-lisp/rmc.el (read-multiple-choice): Add a new argument to
override the default help description in `read-multiple-choice'. Use
the `help-char' variable instead of ?\C-h. Also support the `edit'
action from `query-replace-map', so that help links can be visited by
entering a recursive edit.
* lisp/emacs-lisp/rmc.el (read-multiple-choice): Use `read-event'
which won't get stuck (return the same event over and over again) for
non-character events, unlike `read-char'.
Restore lines saying "Maintainer: emacs-devel@gnu.org" when there is
no special maintainer for a file. Although this wasn't documented
it was common practice and removing the lines didn't have consensus.
