[gtk: 5/5] Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit 6a4f788976c015927e6dcfea826d98694e9f8bd1
Merge: 6b79f691ef 49f2012d24
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Apr 17 23:34:15 2020 +0000

    Merge branch 'matthiasc/for-master' into 'master'
    
    Matthiasc/for master
    
    Closes #1899 and #2627
    
    See merge request GNOME/gtk!1709

 demos/gtk-demo/sliding_puzzle.c         |   5 +-
 demos/node-editor/node-editor-window.ui |   2 +-
 docs/reference/gtk/gtk4-sections.txt    |  10 +-
 docs/reference/gtk/migrating-3to4.xml   |  26 +++
 gtk/gtkaspectframe.c                    | 374 ++++++++++++++++++++------------
 gtk/gtkaspectframe.h                    |  36 ++-
 gtk/theme/Adwaita/_common.scss          |   3 +-
 7 files changed, 302 insertions(+), 154 deletions(-)
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