bug#38209: 26.3; shr-previous-link moves point to images without links

[ynyaaa]

When viewing HTML with EWW, shr-previous-link(Shift-Tab) moves point to
previous images even if they have no links.


In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29 built on CIRROCUMULUS
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor 'Microsoft Corp.', version 6.3.9600
Recent messages:

Configured using:
 'configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS THREADS LCMS2

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 dired dired-loaddefs rfc822
mml mml-sec epa derived epg epg-config mm-decode mm-bodies mm-encode
mailabbrev gmm-utils mailheader sendmail eieio-opt speedbar sb-image
ezimage dframe help-fns radix-tree misearch multi-isearch help-mode
find-func help-at-pt mail-parse rfc2231 url-file url-dired url-cache
url-auth eww puny mm-url gnus nnheader gnus-util rmail rmail-loaddefs
rfc2047 rfc2045 ietf-drums mail-utils wid-edit mm-util mail-prsvr
url-queue url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf url-util url-parse auth-source cl-seq eieio
eieio-core cl-macs eieio-loaddefs password-cache url-vars mailcap shr
svg xml browse-url format-spec mhtml-mode css-mode smie color js advice
json map imenu thingatpt cc-mode cc-fonts easymenu cc-guess cc-menus
cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs sgml-mode seq
byte-opt gv bytecomp byte-compile cconv dom cl-loaddefs cl-lib elec-pair
time-date mule-util 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 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 w32notify w32 lcms2 multi-tty make-network-process
emacs)

Memory information:
((conses 16 180726 35983)
 (symbols 48 40887 2)
 (miscs 40 68 331)
 (strings 32 109527 2910)
 (string-bytes 1 2654674)
 (vectors 16 24163)
 (vector-slots 8 1097281 17376)
 (floats 8 239 554)
 (intervals 56 4936 952)
 (buffers 992 18))