bug#27932: 26.0.50; Feature request: prevent scroll commands from changing the buffer location of point

[Tak Kunihiro]

I have a similar wish.

Without revision of engine I think you can (1) restore point, (2)
preserve region, and (3) extend region.

Those can be implemented in following steps.
 (a) Call minor mode by mouse wheel,
 (b) Store point and region, then
 (c) Restore point when the minor mode is turned off.

One idea to preserve region is to use secondary.  I am waiting for a
patch to be processed.

 http://lists.gnu.org/archive/html/bug-gnu-emacs/2017-06/msg00938.html

-- 
Tak Kunihiro