* lisp/isearch.el (isearch-yank-on-move): New defcustom

* lisp/isearch.el (isearch-yank-on-move): New defcustom

with shift-move related options extracted from `search-exit-option'.
(isearch-pre-command-hook): Rename search-exit-option to
isearch-yank-on-move in shift-move related places.
(isearch-post-command-hook): Check for isearch-pre-move-point
instead of search-exit-option.  (Bug#15839)

* doc/emacs/search.texi (Not Exiting Isearch): Rename
search-exit-option to isearch-yank-on-move.

* lisp/menu-bar.el (menu-bar-i-search-menu): Add more isearch commands.