* lisp/isearch.el (search-exit-option): Add options ‘shift-move’ and ‘move’.
Change type from ‘boolean’ to ‘choice’. Extend docstring.
(isearch-pre-move-point): New variable.
(isearch-pre-command-hook, isearch-post-command-hook):
Handle search-exit-option for values ‘move’ and ‘shift-move’.
* doc/emacs/search.texi (Not Exiting Isearch): Document new
values ‘shift-move’ and ‘move’ of search-exit-option.