Bug is solved in High Sierra Beta 6. Sorry for opening Bug @GNU. Thanx, mario

> Am 12.08.2017 um 20:52 schrieb John Mastro <john.b.mastro@gmail.com>:
> 
> Just for reference for anyone working on this, a discussion in
> which this was mentioned on emacs-devel is here[1] and the workaround
> was reported here[2]. That discussion ended with the OP opening a bug
> with Apple[3].
> 
>        John
> 
> [1]: https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00178.html <https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00178.html>
> [2]: https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00184.html <https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00184.html>
> [3]: https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00187.html <https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00187.html>