Update gtk4 to 4.12.3

[Amin Bandali]

There is a new point release in the stable GTK 4.12 series.

https://gitlab.gnome.org/GNOME/gtk/-/blob/4.12.3/NEWS

The version currently in Ubuntu 23.10 is 4.12.2

Test Case 0
-----------
gtk4 has an extensive build test suite, and failures will fail the build.
gtk4 also has thorough autopkgtests.
Ensure that the build succeeds and that the autopgktests pass.

Test Case 1
-----------
Make sure that opening and saving files from the Firefox and Chromium snaps still work

Test Case 2
-----------
snap install portal-test
snap run portal-test
Verify that the app seems to still work ok

Test Case 3
-----------
Install and test gtk4-demo (from the gtk-4-examples package) as well as a few other GTK/GNOME applications like nautilus and gnome-text-editor, and verify that they continue to launch and work as expected.

What Could Go Wrong
-------------------
Many of the default Ubuntu 23.10 desktop apps use GTK4. A serious enough regression could severely break the Ubuntu Desktop.

Ubuntu includes xdg-desktop-portal-gnome by default which is used for many snap actions like providing a file chooser. This is critical functionality for our snaps. The Ubuntu flavors use a different portal backend, most commonly xdg-desktop-portal-gtk which uses GTK3, so are not affected by this SRU.

gtk4 is included in the GNOME micro release exception.

https://wiki.ubuntu.com/StableReleaseUpdates/GNOME

[Amin Bandali (bandali)]

Ready for review/sponsoring: https://salsa.debian.org/gnome-team/gtk4/-/tree/ubuntu/latest

[Sebastien Bacher (seb128)]

Uploaded now to noble and mantic series

[Timo Aaltonen (tjaalton)]

Hello Amin, or anyone else affected,

Accepted gtk4 into mantic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/gtk4/4.12.3+ds-1ubuntu0.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-mantic to verification-done-mantic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-mantic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Launchpad Janitor (janitor)]

This bug was fixed in the package gtk4 - 4.12.3+ds-1ubuntu1

---------------
gtk4 (4.12.3+ds-1ubuntu1) noble; urgency=medium

  * Merge with Debian (LP: #2038557). Remaining changes:
    - debian/tests:
      + include the memorytexture test in the flaky set, it has been unreliable
    - debian/control:
      + Build-Depend on dh-sequence-translations
    - Switch from the CUPS print backend to CPDB

 -- Amin Bandali <email address hidden> Thu, 05 Oct 2023 11:27:16 -0400

[Amin Bandali (bandali)]

I installed gtk4 4.12.3+ds-1ubuntu0.1 from mantic-proposed on Ubuntu 23.10 and verified:

Test Case 0: The autopkgtests and build tests have all passed.

Test Case 1: Opening and saving files from the Firefox and Chromium snaps still work.

Test Case 2: The portal-test app seems to work about as well as before.

Test Case 3: gtk4-demo, nautilus, and gnome-text-editor continue to launch and work as expected.

[Launchpad Janitor (janitor)]

This bug was fixed in the package gtk4 - 4.12.3+ds-1ubuntu0.1

---------------
gtk4 (4.12.3+ds-1ubuntu0.1) mantic; urgency=medium

  * Merge with Debian (LP: #2038557). Remaining changes:
    - debian/tests:
      + include the memorytexture test in the flaky set, it has been unreliable
    - debian/control:
      + Build-Depend on dh-sequence-translations
    - Switch from the CUPS print backend to CPDB

 -- Amin Bandali <email address hidden> Thu, 05 Oct 2023 11:27:16 -0400

[Timo Aaltonen (tjaalton)]

The verification of the Stable Release Update for gtk4 has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.