[gtk: 2/2] Merge branch 'wip/exalm/buttons' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit 44fea33c5d927cca8c48a40f14ed4f43d9ff5ff4
Merge: e681fdd958 8b48cf11f9
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 3 14:49:09 2021 +0000

    Merge branch 'wip/exalm/buttons' into 'master'
    
    Allow custom children on GtkMenuButton
    
    Closes #4205
    
    See merge request GNOME/gtk!3904

 gtk/gtkmenubutton.c            | 169 ++++++++++++++++++++++++++++++++++++++---
 gtk/gtkmenubutton.h            |   6 ++
 gtk/theme/Default/_common.scss |   9 +++
 3 files changed, 175 insertions(+), 9 deletions(-)
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