gtksourceview3 was superseded by gtksourceview4 in 2018. Both libraries
provide a GTK 3 widget to display source code with syntax highlighting,
for use in text editors and similar applications.

gtksourceview4 has itself been superseded by gtksourceview5 (ITP: #996609), which is for GTK 4 applications.

Applications that use gtksourceview3 should switch to gtksourceview4.
Even if the application is going to be ported to GTK 4 and gtksourceview5,
it is probably a good idea to move to gtksourceview4 first.

Upstream porting guide: https://developer-old.gnome.org/gtksourceview/4.2/porting-guide-3-to-4.html

Mass-filed bugs for this will be usertagged to appear in https://udd.debian.org/cgi-bin/bts-usertags.cgi?user=pkg-gnome-maintainers%40lists.alioth.debian.org&tag=gtksourceview3
and will be marked as blocking #996689. I intend to open bugs at a non-RC severity, but they might be escalated to a RC severity later.

For packages that provide a shared library, such as libgtksourceviewmm,
this change will probably result in a transition (assuming the package
is not removed altogether).

dak says the following packages are affected:

smcv@coccia ~ % dak rm -R -n gtksourceview3

...

# Broken Depends:
almanah: almanah
anjuta: anjuta
autokey: autokey-gtk
coq: coqide [amd64 arm64 armhf i386 ppc64el]
denemo: denemo
desktopfolder: desktopfolder
formiko: formiko
frama-c: frama-c-base
giggle: giggle
gitg: gitg
gnusim8085: gnusim8085
gobby: gobby
gretl: gretl
gtk-d: libgtkdsv-3-0 [amd64 arm64 armel armhf i386 s390x]
libgtkdsv-3-dev [amd64 arm64 armel armhf i386 s390x]
gummi: gummi
java-gnome: libjava-gnome-jni
lablgtk3: liblablgtksourceview3-ocaml
liblablgtksourceview3-ocaml-dev
laby: laby [amd64 arm64 armhf i386 ppc64el s390x]
latexila: latexila
libgtksourceviewmm: libgtksourceviewmm-3.0-0v5
libgtksourceviewmm-3.0-dev
mate-applets: mate-applets
meld: meld
mousepad: mousepad
oregano: oregano
pluma: gir1.2-pluma-1.0
pluma
pspp: pspp
pychess: pychess
pycode-browser: pycode-browser
rednotebook: rednotebook
reportbug: reportbug-gtk
rmlint: rmlint-gui
sequeler: sequeler
snapper-gui: snapper-gui
sugar: python3-jarabe
sugar-pippy-activity: sugar-pippy-activity
why3: why3
xpad: xpad

# Broken Build-Depends:
almanah: libgtksourceview-3.0-dev
anjuta: libgtksourceview-3.0-dev (>= 3.0.0)
denemo: libgtksourceview-3.0-dev
desktopfolder: libgtksourceview-3.0-dev
giggle: libgtksourceview-3.0-dev
gitg: libgtksourceview-3.0-dev (>= 3.10)
gnusim8085: libgtksourceview-3.0-dev (>= 3.10.0)
gobby: libgtksourceview-3.0-dev
gretl: libgtksourceview-3.0-dev
gtk-d: libgtksourceview-3.0-dev
gummi: libgtksourceview-3.0-dev
java-gnome: libgtksourceview-3.0-dev (>= 3.0)
lablgtk3: libgtksourceview-3.0-dev
latexila: libgtksourceview-3.0-dev (>= 3.18)
libgtksourceviewmm: libgtksourceview-3.0-dev (>= 3.18.0)
mate-applets: libgtksourceview-3.0-dev
mousepad: libgtksourceview-3.0-dev
oregano: libgtksourceview-3.0-dev
pluma: libgtksourceview-3.0-dev
pspp: libgtksourceview-3.0-dev (>= 3.22)
pychess: gir1.2-gtksource-3.0
ruby-gnome: libgtksourceview-3.0-dev
sequeler: libgtksourceview-3.0-dev
xpad: libgtksourceview-3.0-dev (>= 3.22)

smcv

Angel Abad <[email protected]>
almanah

Anthony Fok <[email protected]>
autokey (U)
denemo (U)

Balint Reczey <[email protected]>
meld

Ben Pfaff <[email protected]>
pspp (U)

Benjamin Barenblat <[email protected]>
coq (U)

Carlos Maddela <[email protected]>
rmlint

David Mohammed <[email protected]>
desktopfolder

Debian Electronics Team <[email protected]>
gnusim8085

Debian Electronics Team <[email protected]>
oregano

Debian GNOME Maintainers <[email protected]>
anjuta
gitg
gtk-d
libgtksourceviewmm
meld (U)

Debian Java Maintainers <[email protected]>
java-gnome

Debian OCaml Maintainers <[email protected]>
coq
frama-c
lablgtk3
laby
why3

Debian Python Team <[email protected]>
autokey

Debian QA Group <[email protected]>
giggle

Debian Ruby Extras Maintainers <[email protected]>
ruby-gnome

Debian Science Maintainers <[email protected]>
gummi

Debian Science Team <[email protected]>
pspp

Debian Sugar Team <[email protected]>
sugar
sugar-pippy-activity

Debian Xfce Maintainers <[email protected]>
mousepad

Debian+Ubuntu MATE Packaging Team <[email protected]>
mate-applets
pluma

Dirk Eddelbuettel <[email protected]>
gretl

Dmitry Smirnov <[email protected]>
giggle

Dr. Tobias Quathamer <[email protected]>
denemo

Emilio Pozuelo Monfort <[email protected]>
meld (U)

Enrico Tassi <[email protected]>
coq (U)

Friedrich Beckmann <[email protected]>
pspp
pspp (U)

Georges Khaznadar <[email protected]>
pycode-browser

Guilhem Bonnefille <[email protected]>
giggle (U)

Guillaume Mazoyer <[email protected]>
java-gnome (U)

HIGUCHI Daisuke (VDR dai) <[email protected]>
ruby-gnome (U)

Hugo Lefeuvre <[email protected]>
gummi (U)

JCF Ploemen (jcfp) <[email protected]>
xpad

Jendrik Seipp <[email protected]>
rednotebook

Jeremy Bicha <[email protected]>
anjuta (U)
gitg (U)
gtk-d (U)
libgtksourceviewmm (U)
meld (U)

John Paul Adrian Glaubitz <[email protected]>
mate-applets (U)
pluma (U)

Jonas Smedegaard <[email protected]>
sugar (U)
sugar-pippy-activity (U)

Josselin Mouette <[email protected]>
libgtksourceviewmm (U)

Laurent Bigonville <[email protected]>
gitg (U)

Luke Faraone <[email protected]>
autokey
autokey (U)

Manu Mahajan <[email protected]>
java-gnome (U)

Martin Wimpress <[email protected]>
mate-applets (U)

Matthias Klumpp <[email protected]>
gtk-d (U)

Mehdi Dogguy <[email protected]>
frama-c (U)
laby (U)

Michael Biebl <[email protected]>
libgtksourceviewmm (U)

Michael Schutte <[email protected]>
ruby-gnome (U)

Mike Gabriel <[email protected]>
mate-applets (U)
pluma (U)

Nis Martensen <[email protected]>
reportbug (U)

Ondřej Tůma <[email protected]>
formiko

Onkar Shinde <[email protected]>
gnusim8085 (U)

Onkar Shinde <[email protected]>
java-gnome (U)

Paul van Tilburg <[email protected]>
ruby-gnome (U)

Phil Wyett <[email protected]>
rednotebook

Philipp Kern <[email protected]>
gobby

Python Applications Packaging Team <[email protected]>
autokey (U)

Ralf Treinen <[email protected]>
coq (U)
frama-c (U)
lablgtk3 (U)
why3 (U)

Reportbug Maintainers <[email protected]>
reportbug

Ritesh Raj Sarraf <[email protected]>
snapper-gui

Ruben Undheim <[email protected]>
oregano (U)

Samuel Mimram <[email protected]>
coq (U)

Sandro Tosi <[email protected]>
reportbug (U)

Santiago Ruano Rincón <[email protected]>
sugar (U)

Stefano Karapetsas <[email protected]>
mate-applets (U)
pluma (U)

Stéphane Glondu <[email protected]>
coq (U)

Tanguy Ortolo <[email protected]>
latexila

Vangelis Mouhtsis <[email protected]>
mate-applets (U)
pluma (U)

Varun Hiremath <[email protected]>
pychess

Yangfl <[email protected]>
sequeler

Yves-Alexis Perez <[email protected]>
mousepad (U)

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)