gtksourceview3 was superseded in 2018 by gtksourceview4 (a new major
upstream release, but still using GTK 3). There's a porting guide here,
which is mostly "stop using deprecated APIs" plus a few function renames:
https://gnome.pages.gitlab.gnome.org/gtksourceview/gtksourceview5/porting-guide-3-to-4.html

That porting guide is for C code, but the function renames required to move
from gir1.2-gtksource-3.0 to gir1.2-gtksource-4.0 are probably very similar.

gtksourceview3 is unmaintained and hasn't had an upstream release for more
than 5 years, so it would be great if the remaining gtksourceview3
applications can move to gtksourceview4 before trixie.

gtksourceview4 has itself been superseded by gtksourceview5, which is
for GTK 4 applications. Ideally GTK 3 applications should move to GTK 4,
but that's a larger and more intrusive change. Porting guide:
https://docs.gtk.org/gtk4/migrating-3to4.html,
https://gnome.pages.gitlab.gnome.org/gtksourceview/gtksourceview5/porting-guide-4-to-5.html

Thanks,
    smcv

Es gibt eine Familienspende in Höhe von 1.850.000,00 USD von Cheng Charlie
Saephan. Bitte antworten Sie für weitere Informationen. Denken Sie daran,
Ihrer Familie und den Bedürftigen in Ihrer Umgebung Gutes zu tun.

Dies ist bereits der zweite Versuch, Sie zu erreichen. Bitte antworten Sie
für weitere Details.

We believe that the bug you reported is fixed in the latest version of
snapper-gui, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1079426@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Ritesh Raj Sarraf <rrs@debian.org> (supplier of updated snapper-gui package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Wed, 07 Oct 2026 12:52:30 +0530
Source: snapper-gui
Architecture: source
Version: 0git.960a94834f-10
Distribution: unstable
Urgency: medium
Maintainer: Ritesh Raj Sarraf <rrs@debian.org>
Changed-By: Ritesh Raj Sarraf <rrs@debian.org>
Closes: 1079426
Changes:
 snapper-gui (0git.960a94834f-10) unstable; urgency=medium
 .
   * [adb47c9a] Port from GtkSourceView 3 to GtkSourceView 4 (Closes: 1079426)
Checksums-Sha1:
 ce3c41f2fdfce3a327966c498ac4aa1d864aaab7 2003 snapper-gui_0git.960a94834f-10.dsc
 4f0cd857b96429591cee4c0babc2e95869c9c4ee 7372 snapper-gui_0git.960a94834f-10.debian.tar.xz
Checksums-Sha256:
 ac96dc2a89ed02acf051963b09c21021c01aee28f8c6d7a2c9aa8008e5602754 2003 snapper-gui_0git.960a94834f-10.dsc
 999a64239f6d6c948e1182cc72cf2e5812b9048dc75654fcf956024dc657c233 7372 snapper-gui_0git.960a94834f-10.debian.tar.xz
Files:
 898571a4a5b37dec6afe2326ec94c71d 2003 utils optional snapper-gui_0git.960a94834f-10.dsc
 c2e416a7627842745769312538a9bea9 7372 utils optional snapper-gui_0git.960a94834f-10.debian.tar.xz
-----BEGIN PGP SIGNATURE-----
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=c+I8
-----END PGP SIGNATURE-----