* lisp/vc/smerge-mode.el (smerge-refine-shadow-cursor): New variable
and face.
(smerge-refine-regions): Add `cursor-sensor-functions` property
to the covering overlays.
(smerge--refine-at-right-margin-p, smerge--refine-shadow-cursor):
New functions.
(smerge--refine-other-pos): New function, extracted from
`smerge-refine-exchange-point`.
(smerge-refine-exchange-point): Use it.
(smerge--refine-highlight-change): Add thin
highlighted space for insertion/deletion positions.
* lisp/emacs-lisp/cursor-sensor.el (cursor-sensor--detect):
Run functions for `moved` events. Demote errors.
(cursor-sensor-mode): Adjust docstring accordingly.
* doc/lispref/text.texi (Special Properties) <cursor-sensor-functions>:
Mention the new `moved` direction.
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