On Tue, Oct 31, 2017 at 10:04 PM, Tak Kunihiro <homeros.misasa@gmail.com>
wrote:

> >  I cannot drag text among frames yet. I think I still miss something.
> >  Can you show recipe that starts from emacs -Q?
> >
> > ​See if adding this fixes it:
> >
> > (setq mouse-position-function
> >                 (lambda (frame-x-dot-y)
> >                   "Under macOS, mouse-position and mouse-pixel-position
> sometimes fail to return the selected-frame (returning the prior frame
> instead); fix that here."
> >                   (if frame-x-dot-y (setcar frame-x-dot-y
> (selected-frame)))
> >                   frame-x-dot-y))
>
> ;; https://lists.gnu.org/archive/html/emacs-devel/2017-10/msg00804.html
> ;; https://lists.gnu.org/archive/html/emacs-devel/2017-10/msg00591.html
> ;; https://lists.gnu.org/archive/html/emacs-devel/2017-10/msg00588.html
>
> ;; GNU Emacs 27.0.50 (build 2, x86_64-apple-darwin13.4.0, NS
> appkit-1265.21 Version 10.9.5 (Build 13F1911))
> ;;  of 2017-11-01
> ;; ./Emacs -Q
> ;; M-x eval-buffer
>
> I start to see yellow preview text by tooltip on destination frame.
> However, I cannot drop the text yet.  I still miss something.
>

​Maybe it would be best if someone fixed the XSETFRAME macro in
​mouse-position so it works properly under the macOS window system so we
could avoid any work arounds on this.  -- Bob

From mouse-position:
    ;;    f = SELECTED_FRAME ();
    ;;    XSETFRAME (lispy_dummy, f);
    ;;  It seems like the XSETFRAME macro is not properly copying the value
of f on initial frame selection under the macOS window system.