Public bug reported:

Impact
======
There is a new release in the stable 3.24 series.

This also bundles the emoji fixes from LP: #1807719 and LP: #1807721 and
the Xfce flickering fix from LP: #1798861.

https://gitlab.gnome.org/GNOME/gtk/blob/gtk-3-24/NEWS
https://gitlab.gnome.org/GNOME/gtk/compare/3.24.1...3.24.2

Test Case
=========
Run several apps in the default Ubuntu install and make sure that there are no 
visible regressions.

We will also be checking Xfce to validate the fix for LP: #1798861.

Regression Potential
====================
There is a standing microrelease exception for GNOME point releases.

I believe this is the second time in recent history that we've pushed a
gtk point release as an SRU. The other example was 3.22.25 for Ubuntu
17.10 (LP: #1728421). We never ended up doing one for Ubuntu 18.04 LTS
since it already included 3.22.30, the final 3.22 release. It hasn't
been practical to update 18.04's gtk to  the 3.24 series (bumped
dependencies are one problem).

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

By the way, pre-release gtk3 is actually getting a bit more testing than
a year ago since more developers and users are using development Flatpak
releases of popular GNOME apps.

Other Info
==========
One of the bigger changes in the git commit history were theming changes to the 
GNOME default themes (Adwaita and Adwaita Dark which are bundled inside gtk3. 
Ubuntu 18.10 uses the Yaru theme as default instead.). But those changes were 
reverted for this release to make it easier for distros like us to push the 
update to our stable release.

** Affects: gtk+3.0 (Ubuntu)
     Importance: Medium
         Status: Triaged


** Tags: cosmic

** Changed in: gtk+3.0 (Ubuntu)
       Status: Fix Committed => Triaged

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https://bugs.launchpad.net/bugs/1808233

Title:
  Update gtk to 3.24.2

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