[gtk: 7/7] Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit bd3f4599edff3046260d020f3fbb22f4042c928d
Merge: ddf6138d07 8c6bbcdc2e
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue May 26 02:41:37 2020 +0000

    Merge branch 'matthiasc/for-master' into 'master'
    
    Matthiasc/for master
    
    Closes #2778
    
    See merge request GNOME/gtk!1966

 docs/reference/gtk/building.md              |  4 ++--
 docs/reference/gtk/migrating-3to4.md        | 14 ++++++++++++++
 gdk/wayland/gdkkeys-wayland.c               |  1 +
 gtk/gtkaccelgroup.c                         |  6 ------
 gtk/gtkbitmaskprivateimpl.h                 |  2 ++
 modules/printbackends/gtkprintbackendcups.c | 24 +++++++++---------------
 6 files changed, 28 insertions(+), 23 deletions(-)
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