bug#39103: 26.3; xclip.el 1.9 doesnt copy&paste under Wayland

[apiraino via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Features:
 I'm using xclip.el version 1.9 (installed from ELPA) and I was fine with X11. I've recently switched to Sway (a window manager for Wayland) and xclip.el should support copy and paste out of the box, after configuring it to use wl-clipbaord.

 However I can't paste text snippets out of Emacs, I think because I can't set primary mode for wl-copy and wl-paste. Any suggestion on how to configure or fix xclip.el to do that?

 Here's what I do

 - Open a file into a buffer
 - Select a region and copy it with "M w" to copy it
 - Try to paste in another application that runs under Wayland of Xwayland (such as Firefox)

 From the cli, everything's fine:

 $ wl-copy -p heyhey
 $ wl-paste -p
 heyhey

 Also, inside Emacs copy&paste works fine.

 This is my current xclip.el config

 Hide Xclip Method: [Value Menu] Wayland: wl-copy
   [ State ]: SAVED and set.

 Hide Xclip Mode: [Toggle]  on (non-nil)
   [ State ]: CHANGED outside Customize.

 Hide Xclip Program: wl-copy
   [ State ]: STANDARD.

 Hide Xclip Select Enable Clipboard: [Toggle]  on (non-nil)
   [ State ]: STANDARD.

 In GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu)
 of 2019-09-23, modified by Debian built on lgw01-amd64-032
 System Description:	Ubuntu 19.10

 Recent messages:
 For information about GNU Emacs and the GNU system, type C-h C-a.
 Making completion list...
 Making completion list...
 Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --enable-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.3/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --build
 x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
 --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.3/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --with-x=no
 --without-gsettings 'CFLAGS=-g -O2
 -fdebug-prefix-map=/build/emacs-wvqver/emacs-26.3+1=. -fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

 Configured features:
 JPEG SOUND GPM DBUS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 ZLIB XIM
 THREADS LIBSYSTEMD LCMS2

 Important settings:
  value of $LC_MONETARY: de_DE.UTF-8
  value of $LC_NUMERIC: de_DE.UTF-8
  value of $LC_TIME: de_DE.UTF-8
  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
  eldoc-mode: t
  electric-indent-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-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.

 (shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
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 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 dbusbind
 inotify lcms2 multi-tty make-network-process emacs)

 Memory information:
 ((conses 16 95566 6808)
 (symbols 48 19452 1)
 (miscs 40 41 96)
 (strings 32 27841 958)
 (string-bytes 1 740354)
 (vectors 16 11870)
 (vector-slots 8 448930 6250)
 (floats 8 49 569)
 (intervals 56 301 13)
 (buffers 992 12))
Date: Sun, 12 Jan 2020 18:46:21 +0100
Message-ID: <87y2uch8k2.fsf@localhost.i-did-not-set--mail-host-address--so-tickle-me>

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