bug#23288: 25.0.92; Clicking on links inserts primary X selection

[Philipp Stephani <p.stephani2@gmail.com>]

Here 'emacs' is an Emacs binary using Gtk+ on GNU/Linux.

echo -n bar | xsel -i && \
  emacs -Q -eval \
  "(insert (propertize \"foo\" 'follow-link (lambda (pos) \"a\")))"

Then click on "foo" in the scratch buffer.  If 'emacs' is Emacs 24.3,
"a" will be inserted.  If 'emacs' is from the emacs-25 branch, "bar"
will be inserted.  I think this is a regression; follow-link should
adhere to the link action no matter what is in the X selection.



In GNU Emacs 25.0.92.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2016-04-14 built on localhost
Repository revision: 567ab529f313bc8fe68d25b2ca95f5987cce81a1
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

Configured using:
 'configure --with-modules CFLAGS=-g'

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-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

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu
cl-loaddefs pcase cl-lib mail-prsvr mail-utils time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core 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 charscript case-table epa-hook
jka-cmpr-hook help simple abbrev 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 inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 88168 9879)
 (symbols 48 19855 0)
 (miscs 40 325 173)
 (strings 32 14741 4231)
 (string-bytes 1 437388)
 (vectors 16 12106)
 (vector-slots 8 439789 6169)
 (floats 8 164 78)
 (intervals 56 208 0)
 (buffers 976 12)
 (heap 1024 24962 1011))

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