martin rudalics <rudalics@gmx.at> writes:
> Could you try testing it
> with three and more side-by-side windows and all sorts of clicks ruler
> mode can handle and possibly post a corresponding patch?
>

Hi, here's my tentative patches. I checked out from
http://git.savannah.gnu.org/cgit/emacs.git, last
commit was 6449128a5ab4a47a281de6117b86661dcc05b599, and
made two patches.

  First patch applies the changes that we supposed could
solve the problem of the wrong offset.