bug#37909: 25.3; repeat does not repeat yank correctly

[Ulrich Windl]

Trying to repeat the last yank 98 times using "C-u 98 M-x repeat" turned out
that the last yank wasn't inserted 98 times, but the last character of the last
yank (which is quite unexpected). Most preferrably as a vi-user I'd like C-u 98
C-y to yank the last kill 98 times, but things seem different.

For the records: The last kill was "' '{L/R:D=I<1-49>C<6>S< >U}
{L/R:D=I<0-9>}'", and the text inserted was
"''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''".

In GNU Emacs 25.3.1 (x86_64-suse-linux-gnu, GTK+ Version 3.22.30)
 of 2019-05-04 built on lamb70
Windowing system distributor 'The X.Org Foundation', version 11.0.12003000
System Description:    openSUSE Leap 15.1

Configured using:
 'configure --with-pop --without-hesiod --with-kerberos --with-kerberos5
 --with-xim --with-wide-int --with-file-notification=inotify
 --with-modules --enable-autodepend --prefix=/usr
 --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share
 --localstatedir=/var --sharedstatedir=/var/lib --libexecdir=/usr/lib

--enable-locallisppath=/usr/share/emacs/25.3/site-lisp:/usr/share/emacs/site-lisp
 --with-x --with-sound --with-xpm --with-jpeg --with-tiff --with-gif
 --with-png --with-rsvg --with-dbus --with-xft --without-gpm
 --with-x-toolkit=gtk3 --with-xwidgets --with-toolkit-scroll-bars
 --x-includes=/usr/include --x-libraries=/usr/lib64 --with-libotf
 --with-m17n-flt --build=x86_64-suse-linux 'CFLAGS=-fmessage-length=0
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 -pipe -Wno-pointer-sign -Wno-unused-variable -Wno-unused-label
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 -DSYSTEM_PURESIZE_EXTRA=55000 -DSITELOAD_PURESIZE_EXTRA=10000 '
 LDFLAGS=-Wl,-O2'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES XWIDGETS

Important settings:
  value of $LC_CTYPE: de_DE.UTF-8
  value of $LC_NUMERIC: POSIX
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Shell-script

Minor modes in effect:
  sh-electric-here-document-mode: t
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  show-paren-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
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  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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Undo! [2 times]
Mark set
Repeating command 98 self-insert-command
You can run the command ‘repeat’ with C-x z
Repeating command 98 self-insert-command
Undo!
Mark set
Undo!
Making completion list... [2 times]
GNU Emacs 25.3.1 (x86_64-suse-linux-gnu, GTK+ Version 3.22.30) of 2019-05-04

Load-path shadows:
/usr/share/emacs/site-lisp/lilypond-init hides
/usr/share/emacs/site-lisp/site-start.d/lilypond-init

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xwidget-internal move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 315008 16003)
 (symbols 48 31274 0)
 (miscs 40 462 461)
 (strings 32 52716 9687)
 (string-bytes 1 1531952)
 (vectors 16 47137)
 (vector-slots 8 859179 3988)
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