[gtk: 6/6] Merge branch 'wip/exalm/buttons' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit bf97dfd998f4f6f3c32e4e8ac8f6c434e658ae77
Merge: c7f4131402 47b5c68df4
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jun 28 19:10:57 2021 +0000

    Merge branch 'wip/exalm/buttons' into 'master'
    
    GtkMenuButton icon+arrow support + fixes
    
    Closes #3501
    
    See merge request GNOME/gtk!3694

 gtk/gtkbutton.c                |  14 +++-
 gtk/gtkmenubutton.c            | 181 +++++++++++++++++++++++++++++++++++------
 gtk/gtkmenubutton.h            |   6 ++
 gtk/theme/Default/_common.scss |   4 +
 4 files changed, 178 insertions(+), 27 deletions(-)
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