Public bug reported:

[ Impact ]

4.14.5 is a new bugfix release from upstream:
https://gitlab.gnome.org/GNOME/gtk/-/blob/4.18.5/NEWS?ref_type=tags

* Bugs fixed:
  - #5844 `gdk_surface_get_device_position: assertion 'GDK_IS_SURFACE (surface)'
    failed` on popover close (Alessandro Astone)
  - #7451 Cairo device scale changes lead to significant performance regression
    in cairo blur (Sebastian Keller) (bug 2107245)
  - #7479 gtkmm programs fail to start on Windows with AccessKit support enabled
    (Matthias Clasen)
  - #7482 Epiphany Crash in GTK file chooser when last used directory has
    insufficient filesystem permissions: "GFileInfo created without
    standard::type" (Philip Withnall)
  - #7495 Failed to link with the mold linker (Matthias Clasen)
  - #7513 Broken boxed-list ListBox (Sergey Bugaev)
  - #7520 XCompose preventing GTK4 applications from launching (again) (Matthias
    Clasen)
  - #7522 critical when selecting label with use-underline but mnemonic with
    screenreader enabled (Markus Göllnitz)

[ Test Plan ]

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 --edge
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 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 using GTK4. 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.

[ Other info ]

gtk4 is included in the GNOME micro release exception.

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

** Affects: gtk4 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
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Desktop Bugs, which is subscribed to gtk4 in Ubuntu.
https://bugs.launchpad.net/bugs/2109978

Title:
  [SRU] Update gtk4 to 4.14.5 for Noble

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