Nothing Emacs can do here as it never sees the key press. You need to
modify your keyboard shortcut preferences in macOS using System Preferences
-> keyboard -> shortcuts. You will likely find other useful Emacs bindings
which have been stolen by macOS and which will also need to be
adjusted/removed


On Sat, 22 Dec 2018 at 09:29, Leo Liu <sdl.web@gmail.com> wrote:

> On 2018-11-16 18:56 +0900, YAMAMOTO Mitsuharu wrote:
> > The fourth update of the Mac port based on Emacs 26.1 is now available
> > from
> >
> >   ftp://ftp.math.s.chiba-u.ac.jp/emacs/emacs-26.1-mac-7.4.tar.gz
>
> After upgrade to mojave 10.14.2 (from 10.12) I have noticed one rather
> inconvenient change from the OS. M-% is now intercepted by the OS to
> capture screen. Is there any workaround for this?
>
> Thanks,
> Leo
>
>

-- 
regards,

Tim

--
Tim Cross