bug#27973: [PATCH] Add ability to change macOS WM theme (bug#27973)

[Eli Zaretskii]

> Date: Sun, 13 Aug 2017 14:11:10 +0100
> From: Alan Third <alan@idiocy.org>
> Cc: 27973@debbugs.gnu.org
> 
> * src/frame.c (make_frame, frame_parms, syms_of_frame)
> [NS_IMPL_COCOA]: Add ns-appearance and ns-transparent-titlebar
> options.

This should be mentioned in the documentation somewhere, I think.
Including how to use it to solve whatever problems we have with themes
on NS.

> * src/frame.h (ns_appearance_type) [NS_IMPL_COCOA]: Add enum to
> represent NSAppearance options.
> (struct frame) [NS_IMPL_COCOA]: Add ns_appearance and
> ns_transparent_titlebar frame parameters.
> * src/nsfns.m (ns_frame_parm_handlers) [NS_IMPL_COCOA]: Add
> ns_set_appearance and ns_set_transparent_titlebar handlers.
> (Sx_create_frame): Handle ns-appearance and ns-transparent-titlebar
> frame parameters.

Is the transparency thing, or its equivalent, supported on GNU/Linux?

Thanks.