bug#44929: 28.0.50; Info-next-reference skips next reference

[Stephen Berman]

0. emacs -Q
1. C-h r (if emacs is installed, otherwise `C-u h i /path/to/emacs.info
   RET')
2. Repeat `C-n' until the cursor is on the '*' before the first menu
   item 'Distrib'.
3. Type TAB
=> The cursor jumps over 'Distrib' and goes to the second menu item
   'Intro'.

The same thing happens if the cursor is on the space between '*' and
'Distrib' and you then press TAB.  In both cases, I expected the cursor
to go to the immediately following link instead of skipping it.  This
behavior annoys me every time I run into it, but I haven't debugged it
till now.  The attached patch fixes it.  (The code responsible for the
current behavior in Info-next-reference has not changed since the
command was added to Emacs, but I hope you'll nevertheless agree it's a
bug.)

In GNU Emacs 28.0.50 (build 42, x86_64-pc-linux-gnu, GTK+ Version 3.24.17, 
cairo version 1.17.3)
 of 2020-11-21 built on strobe-jhalfs
Repository revision: 0a8cd0116204354e95fbb4ebde64c58123502aa2
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Linux From Scratch SVN-20200401

Configured using:
 'configure --with-xwidgets 'CFLAGS=-Og -g3'
 PKG_CONFIG_PATH=/opt/qt5/lib/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS LIBSYSTEMD PDUMPER LCMS2

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

Info-next-reference.diff
Description: Text Data