[gtk] (2 commits) ...Merge branch 'add-gtk-dropdown-buildable-example' into 'main'

From: Matthias Clasen <matthiasc src gnome org>
To: commits-list gnome org
Cc:
Subject: [gtk] (2 commits) ...Merge branch 'add-gtk-dropdown-buildable-example' into 'main'
Date: Sun, 8 May 2022 22:15:33 +0000 (UTC)

Summary of changes:

  5a0d6e3... dropdown: Add UI definition example
  8533824... Merge branch 'add-gtk-dropdown-buildable-example' into 'mai