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

[Van L]

-- A
1. started `emacs -Q` in XQuartz/Darwin
2. C-x b *scratch*
3. C-x 5 2 ;; new frame
4. C-h b ;; bindings for keys in new window of new frame
5. C-x s self ;; find \200
6. able to copy unicode \200 detail buffer to *scratch*
7. unable to copy eight-bit \200 detail buffer to *scratch*

-- misc: before beginning to bisect .emacs

: 1-6 are single instance runs of emacs
: 7 is single instance run of `emacs -Q` where problem was reproduced

: 1
: [no problem the first time]
: GNU Emacs 26.2 (build 1, x86_64-apple-darwin15.6.0, X toolkit)
: of 2019-03-21

: 2
: [has doom-modeline, doom-theme]
: [no problem the first time]
: GNU Emacs 26.1.92 (build 2, x86_64-apple-darwin15.6.0, Carbon Version 157 
AppKit 1404.47)
: of 2019-03-22

: 3
: ssh -Xf XXX emacs
: [has problem the first time]
: [has doom-modeline]
: GNU Emacs 26.1 (build 1, x86_64--netbsd, X toolkit, Xaw3d scroll bars)
: of 2019-03-17

: 4
: [has problem the second time]
: GNU Emacs 26.2 (build 1, x86_64-apple-darwin15.6.0, X toolkit)
: of 2019-03-21

: 5
: [has doom-modeline, doom-theme]
: [has no problem the second time]
: GNU Emacs 26.1.92 (build 2, x86_64-apple-darwin15.6.0, Carbon Version 157 
AppKit 1404.47)
: of 2019-03-22

: 6
: [has problem the third time]
: [on XQuartz]
: [~/bin/emacs26.2r1 links to €nfs€/build/emacs26.2-rc1/bin/emacs-26.2]
: GNU Emacs 26.2 (build 1, x86_64-apple-darwin15.6.0, X toolkit)
: of 2019-03-21

: 7 `emacs -Q`
: [this is the first time for `emacs -Q]
: [has problem the forth time run for thise version]
: [on XQuartz]
: [~/bin/emacs26.2r1 links to €nfs€/build/emacs26.2-rc1/bin/emacs-26.2]
: GNU Emacs 26.2 (build 1, x86_64-apple-darwin15.6.0, X toolkit)
: of 2019-03-21



In GNU Emacs 26.2 (build 1, x86_64-apple-darwin15.6.0, X toolkit)
 of 2019-03-21 built on XXX.XXX
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
Recent messages:
Mark saved where search started

Char:   (128, #o200, #x80, file ...) point=1166 of 27318 (4%) column=0
Mark set [3 times]

Mark saved where search started

Char:   (4194176, #o17777600, #x3fff80, raw-byte) point=10875 of 37045 (29%) 
column=0
Mark set [9 times]
Making completion list... [2 times]

Configured using:
 'configure --target x86_64-apple-darwin15.6.0
 --prefix=/Users/XXX/opt/share/build/emacs26.2-rc1
 --with-mailutils --without-imagemagick --with-sound=no --with-dbus
 --disable-ns-self-contained --without-ns --without-toolkit-scroll-bars
 --with-x --with-x-toolkit=lucid --with-modules --with-jpeg=no
 --with-gif=no --with-tiff=no'

Configured features:
XAW3D XPM PNG RSVG DBUS GSETTINGS GLIB NOTIFY ACL GNUTLS LIBXML2
FREETYPE XFT ZLIB LUCID X11 XDBE XIM MODULES THREADS

Important settings:
  value of $LANG: en_AU.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
mml-sec password-cache epa derived epg epg-config gnus-util rmail
rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils wid-edit descr-text misearch multi-isearch
kmacro two-column iso-transl help-mode easymenu cl-loaddefs cl-lib
elec-pair time-date mule-util tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core term/tty-colors frame cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind kqueue
dynamic-setting system-font-setting font-render-setting x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 118210 20908)
 (symbols 48 32912 1)
 (miscs 40 1896 216)
 (strings 32 90246 2940)
 (string-bytes 1 2096897)
 (vectors 16 24424)
 (vector-slots 8 1703098 157156)
 (floats 8 63 259)
 (intervals 56 562 80)
 (buffers 992 13))