bug#23647: 25.1.50; In man pages, links on hyphenated words don't work

[Stephen Berman]

O. emacs -Q
1. Open a man page that has a link on a hyphenated word, e.g. on my
   system: M-x man RET signal RET, put point on the word spanning lines
   129-130, which is displayed as `sig-
   nalfd(2)'.
2. Type RET (or click mouse-1 or mouse-2) on that link.
=> The error message "Can’t find the 2 sig-nalfd manpage" is displayed.

The following patch makes the link DTRT:

diff --git a/lisp/man.el b/lisp/man.el
index 5acf90b..5d4cacc 100644
--- a/lisp/man.el
+++ b/lisp/man.el
@@ -1430,8 +1430,14 @@ Man-bgproc-sentinel
                        (quit-restore-window
                         (get-buffer-window (current-buffer) t) 'kill)
                      (kill-buffer (current-buffer)))
-                   (message "Can't find the %s manpage"
-                            (Man-page-from-arguments args)))
+                    ;; Entries hyphenated due to the window width
+                    ;; won't be found in the man database, so remove
+                    ;; the hyphenation and look again.
+                   (if (string-match "-" args)
+                       (let ((str (replace-match "" nil nil args)))
+                         (Man-getpage-in-background str))
+                      (message "Can't find the %s manpage"
+                               (Man-page-from-arguments args))))
 
                (if Man-fontify-manpage-flag
                    (message "%s man page formatted"

This is a long-standing bug (presumably since commit
162a12b1d7b1e985a8810bad24d068c825286f56 of Sep 13 2007), but although
the fix seems safe, I suppose it's too late for emacs-25.  So if there
are no objections, should I commit it to master, or is it ok for the
upcoming release?


In GNU Emacs 25.1.50.19 (x86_64-suse-linux-gnu, GTK+ Version 3.14.15)
 of 2016-05-28 built on rosalinde
Repository revision: 4ef0fc192b8a10625053dbb9376c814e68612eb6
Windowing system distributor 'The X.Org Foundation', version 11.0.11601000
System Description:     openSUSE 13.2 (Harlequin) (x86_64)

Configured using:
 'configure --with-xwidgets 'CFLAGS=-Og -g3''

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

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