On Wed, Oct 11, 2017 at 9:35 PM, Robert Weiner <rsw@gnu.org> wrote:

>
> Is there any way to deal with external window z-order layering such that
> one can tell within Emacs whether the topmost OS-level window at an
> absolute mouse position is an Emacs frame or not?
>

​One idea is to expand frame-list-z-order with a 2nd optional argument of
all-display-windows-flag which when non-nil would include all of the
OS-level windows in the returned list.  Maybe a new object type or
frame-variant is needed for this.  Then just add another function that
returns the edge coordinates for such windows and we could account for them
in any z-ordering computations.  What do you think?

Bob
​