GNU logs - #79966, boring messages

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Subject: bug#79966: 31.0.50; iso-8859-1 usage by selection code under Wayland
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Cc: Po Lu <luangruo@HIDDEN>
From: Robert Pluim <rpluim@HIDDEN>
Date: Mon, 08 Dec 2025 15:19:14 +0100
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This is a pgtk build of master, running under Wayland, no XWayland is
involved.

This arose from
<https://emacs.stackexchange.com/questions/85255/encoding-issue-with-pgtk-b=
uild-on-wayland-umlauts-dont-reach-chromium/85276#85276>

Chromium is requesting the contents of the clipboard using the 'TEXT
type. The buffer and the clipboard contain "=C3=AB". Emacs ends up in
`xselect--encode-string', where it decides to use 'iso-8859-1' to
encode the string, which Chromium then does not understand, and we get
mojibake.

Forcing `xselect--encode-string' to use 'utf-8 for 'TEXT results in
Chromium inserting the correct text, but I don=CA=BCt know if that is the
correct fix. Wayland appears to assume utf-8 for text, but I=CA=BCve failed
in finding a definitive reference for that.

(based on its docstring, setting `selection-coding-system' to 'utf-8
should have fixed it, but that=CA=BCs ignored, since (coding-system-type
'utf-8) is not 'charset.)

The following patch fixes it for me, but comments from someone more
knowledgeable are welcome. It=CA=BCs possible it will fail horribly when
running a pgtk build under X or XWayland, but I=CA=BCve decided not to
think about that.

diff --git a/lisp/select.el b/lisp/select.el
index 59eedc79263..59fd0650ba5 100644
--- a/lisp/select.el
+++ b/lisp/select.el
@@ -598,7 +598,8 @@ xselect--encode-string
 	  ;; (see ns_string_to_pasteboard_internal in nsselect.m).
 	  (when (eq type 'TEXT)
 	    (cond
-	     ((featurep 'ns)
+             ((or (featurep 'ns)
+                  (featurep 'pgtk))
 	      (setq type 'UTF8_STRING))
 	     ((not (multibyte-string-p str))
 	      (setq type 'C_STRING))

In GNU Emacs 31.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.4) of 2025-12-02 built on rlsb
Repository revision: f762ce48d56534f3130470ebae7e276f707d51aa
Repository branch: master
System Description: Debian GNU/Linux 13 (trixie)

Configured using:
 'configure --with-pgtk'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
JPEG LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB

Robert
--=20

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Date: Mon, 08 Dec 2025 18:38:14 +0200
Message-Id: <86ms3tszd5.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Stefan Kamphausen <ska2342@HIDDEN>, Robert Pluim <rpluim@HIDDEN>
In-Reply-To: <CA+0DxOi5Gh7YvSFdy6few89ek7f6VUMzqhOBUoOYJrD-+-mAGw@HIDDEN>
 (message from Stefan Kamphausen on Mon, 8 Dec 2025 14:43:13 +0100)
Subject: Re: bug#79967: 30.1;
 Pure Gtk Build Uses Wrong Encoding for Sending to Clipboard (Chromium
 only?)
References: <CA+0DxOi5Gh7YvSFdy6few89ek7f6VUMzqhOBUoOYJrD-+-mAGw@HIDDEN>
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merge 79967 79966
thanks

> From: Stefan Kamphausen <ska2342@HIDDEN>
> Date: Mon, 8 Dec 2025 14:43:13 +0100
> 
> Dear Emacs Bug Squashers,
> 
> My problem is that text with umlauts pasted /only/ from Emacs /only() to
> Chromium gets garbled: "oö aä uü" becomes "o� a� u�" 
> - Verified with hexdump(and C-u C-x =) that the char in buffer in Emacs
> and in the file is actually UTF-8.
> 
> - I can paste from Emacs into Firefox, Kate, terminals, Thunderbird,
> Libreoffice and others without any problems.
> 
> - I can past into Chromium from all those applications without any
> problems.
> 
> - Yes, Chromium replaces the characters with REPLACEMENT
> CHARACTERs. Copy-and-pasting from there continues with the
> replacement character. 
> 
> - If I edit the clipbuffer in the KDE Plasma clipboard util – e.g. add a
> space and save the new clip –, I can paste into Chromium without any
> problems.
> 
> - Verified with emacs -q that it's not connected to my settings.

This seems a duplicate of bug#79966, so I'm merging them.

> 
> I posted this on Stackexchange earlier:
> https://emacs.stackexchange.com/questions/85255/encoding-issue-with-pgtk-build-on-wayland-umlauts-dont-reach-chromium
> 
> 
> My environment:
> 
> - Emacs 30.1 pgtk (switched to this because of the abysmal performance
> of windows resizing on Wayland that literally takes 10 seconds and
> longer to change the size of a window.) 
> 
> - Wayland
> 
> - Kubuntu 25.10
> 
> - KDE Plasma 6.5.3
> 
> - Kernel 6.17.0.6
> 
> - Shell env: LANGUAGE=de_DE:en_US
> 
> - Shell env: LANG=en_US.UTF-8

Thanks.

Last modified: Mon, 8 Dec 2025 16:45:01 UTC

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