bug#34331: 27.0.50; Undo too granular after C-y M-y M-y ...

[N. Jackson]

After pasting with C-y M-y M-y M-y ... , undo should (I think) undo the
paste.  Instead, it only undoes the final M-y.  One needs to undo
over-and-over-again to get back to the state before the paste operation
was begun.


In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2019-01-12 built on moondust.localdomain
Repository revision: c48ea7c08c95185ddce266744a1959e0ce6b04e1
Repository branch: master
Windowing system distributor 'Fedora Project', version 11.0.11906000
System Description: Fedora 28 (Workstation Edition)

Configured using:
 'configure 'CFLAGS=-O3 -g3 -gdwarf-4' --enable-checking'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM THREADS LCMS2 GMP

Important settings:
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
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  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Features:
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custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
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