Use <up> and <down> keys to move point in the multi-line minibuffer.

* lisp/bindings.el (minibuffer-local-map): Rebind [down] from
next-history-element to next-line-or-history-element, and [up]
from previous-history-element to previous-line-or-history-element.

* lisp/simple.el (next-line-or-history-element)
(previous-line-or-history-element): New commands.

http://lists.gnu.org/archive/html/emacs-devel/2014-11/msg00822.html
* lisp/replace.el (query-replace-from-to-separator): Turn defvar into defcustom.
Wrap char-displayable-p in ignore-errors because an attempt
to autoload char-displayable-p fails during pre-loading.
Move (propertize "\0" ... 'separator t) out of customizable part
to query-replace-read-from.
(query-replace-read-from): Call custom-reevaluate-setting on
query-replace-from-to-separator to reevaluate the separator
depending on the return value of char-displayable-p.
http://lists.gnu.org/archive/html/emacs-devel/2014-11/msg00466.html
* lisp/progmodes/grep.el (grep-compute-defaults): Compute grep-highlight-matches before its use.