bug#34969: 26.2; `emacs -Q` unable to copy \200's eight-bit detail buffer

[Eli Zaretskii]

> From: Van L <van@scratch.space>
> Date: Sun, 31 Mar 2019 12:02:25 +1100
> Cc: 34969@debbugs.gnu.org
> 
> > What happens if you set interprogram-cut-function and
> > interprogram-paste-function to nil?
> 
> -- running with .emacs at remote X11
> GNU Emacs 26.1 (build 1, x86_64--netbsd, X toolkit, Xaw3d scroll bars)
>  of 2019-03-27
> 
> : (setq interprogram-cut-function nil)
> : (setq interprogram-paste-function nil)
> 
> Setting the above allows the 2nd copy of \200 to paste correctly after it 
> misfires and pastes the 1st copy, unexpectedly.

This confirms my theory that the problem is somehow related to
clipboard operations.  Someone more knowledgeable in Mac and *BSD
systems will have to chime in to investigate further, if you cannot
find which part of your system is responsible for this, and what
exactly is the problem.

> Once the misfire occurs the XQuartz app fails to seamlessly copy/paste from 
> X11 environment to this Mail app, for example. 
> 
> Calling copy from the app's toolbar menu will allow copy/paste correctly.

I think this just further confirms my theory.

Thanks.