* lisp/replace.el: History for query replace pairs.
(query-replace-defaults): Promote to a list of cons cell.  Doc fix.
(query-replace-from-to-separator): New variable.
(query-replace-read-from): Let-bind query-replace-from-to-history
to a list of FROM-TO strings created from query-replace-defaults
and separated by query-replace-from-to-separator.  Use it as
the history while reading from the minibuffer.  Split the returned
string by the separator to get FROM and TO parts, and add them
to the history variables.
(query-replace-read-to): Add FROM-TO pairs to query-replace-defaults.
(query-replace-regexp-eval): Let-bind query-replace-defaults to nil.
http://lists.gnu.org/archive/html/emacs-devel/2014-11/msg00253.html

* lisp/isearch.el (isearch-text-char-description): Keep characters
intact and put formatted strings with the `display' property.