[gtk/gtk-3-24] (2 commits) ...Merge branch 'nested-headerbar-3' into 'gtk-3-24'

From: Jakub Steiner <jimmac src gnome org>
To: commits-list gnome org
Cc:
Subject: [gtk/gtk-3-24] (2 commits) ...Merge branch 'nested-headerbar-3' into 'gtk-3-24'
Date: Mon, 10 Sep 2018 08:58:08 +0000 (UTC)

Summary of changes:

  f0696df... Adwaita: Drop the background of nested headerbars
  85a98d5... Merge branch 'nested-headerbar-3' into 'gtk-3-24'