bug#46464: 27.1; wide images are hidden partially at the right edge of window

[ynyaaa]

Evaluate the form below, 10 images are inserted in one logical line.
The fourth image of the first visual line and the fourth image of the
secodn visual line are hidden partially at the right edge of the window,
where (frame-char-width) => 8 and (window-text-width) => 80.

Also #'previous-line works strangely.
>From the end of the 3rd visual line(next to the 2nd image of the line),
type C-p, then the point moves to the 3rd image of the 2nd line,
type C-p, then the point moves to the 1st image of the 2nd line,
type C-p, then the point moves to the 3rd image of the 1st line,
type C-p, then the point moves to the 1st image of the 1st line,
type C-p, then the point moves to the column of the previous line near
the 3rd image.

(let* ((w 200)
       (h 50)
       (form "<svg width=\"%d\" height=\"%d\" version=\"1.1\"
 xmlns=\"http://www.w3.org/2000/svg\";>
 <rect x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" fill=\"%s\"/>
</svg>")
       (s (propertize "%c" 'face '(:height 10.0))))
  (dotimes (i 10)
    (let* ((color (nth (% i 5) '("red" "green" "blue" "yellow" "orange")))
           (svg (format form w h 0 0 w h color)))
      (insert-image (create-image svg 'svg t :scale 1)))))



In GNU Emacs 27.1 (build 1, x86_64-w64-mingw32)
 of 2020-08-22 built on CIRROCUMULUS
Repository revision: 86d8d76aa36037184db0b2897c434cdaab1a9ae8
Repository branch: HEAD
Windowing system distributor 'Microsoft Corp.', version 10.0.18363
System Description: Microsoft Windows 10 Pro (v10.0.1909.18363.1316)

Recent messages:

Configured using:
 'configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY W32NOTIFY ACL GNUTLS LIBXML2
HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: JPN
  locale-coding-system: cp932

Major mode: Emacs-Lisp

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 dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs text-property-search time-date
subr-x seq byte-opt gv bytecomp byte-compile cconv mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
misearch multi-isearch term/bobcat japan-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel dos-w32 ls-lisp
disp-table term/w32-win w32-win w32-vars term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame minibuffer 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
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 w32notify w32
lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 59623 8847)
 (symbols 48 6128 1)
 (strings 32 17432 1478)
 (string-bytes 1 567630)
 (vectors 16 10820)
 (vector-slots 8 209933 10204)
 (floats 8 21 68)
 (intervals 56 579 0)
 (buffers 1000 12))