* simple.el (deactivate-mark): Optional argument FORCE.

* simple.el (deactivate-mark): Optional argument FORCE.
(set-mark): Use deactivate-mark.

* info.el (Info-search): No need to check transient-mark-mode
before calling deactivate-mark.

* select.el (x-set-selection): Doc fix.
(x-valid-simple-selection-p): Allow buffer values.
(xselect--selection-bounds): Handle buffer values.  Suggested by
David De La Harpe Golden.

* mouse.el (mouse-set-region, mouse-drag-track): Call
copy-region-as-kill before setting the mark, to let
select-active-regions work.

* simple.el (deactivate-mark): If select-active-regions is
non-nil, copy the selection data into a string.
(activate-mark): If select-active-regions is non-nil, set the
selection to the current buffer.
(set-mark): Update selection if select-active-regions is non-nil.

* select.el (x-valid-simple-selection-p): Allow buffer values.