[gtk: 2/2] Merge branch 'aboutwindow' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit 490163efcddddf17faee51db627dd6f4a1e77042
Merge: e532f2322b a17f33b1fe
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Oct 6 18:25:27 2020 +0000

    Merge branch 'aboutwindow' into 'master'
    
    gtkaboutdialog: Directly specialize GtkWindow
    
    See merge request GNOME/gtk!2666

 docs/reference/gtk/migrating-3to4.md |   5 ++
 gtk/gtkaboutdialog.c                 | 120 +++++------------------------------
 gtk/gtkaboutdialog.h                 |   2 +-
 gtk/ui/gtkaboutdialog.ui             |   6 +-
 4 files changed, 26 insertions(+), 107 deletions(-)
---