[gtk: 7/7] Merge branch 'wip/exalm/titlebuttons' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit 7f1e82d1bccf73d39a7411fc310eb51b62c4e8a8
Merge: 796bc9bde1 b5d61eb2c8
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Apr 26 13:09:35 2020 +0000

    Merge branch 'wip/exalm/titlebuttons' into 'master'
    
    GtkWindowControls + GtkHeaderBar cleanups
    
    See merge request GNOME/gtk!1755

 docs/reference/gtk/gtk4-docs.xml     |   1 +
 docs/reference/gtk/gtk4-sections.txt |  21 ++
 docs/reference/gtk/gtk4.types.in     |   1 +
 gtk/gtk.h                            |   1 +
 gtk/gtkheaderbar.c                   | 461 +++--------------------
 gtk/gtkwindowcontrols.c              | 691 +++++++++++++++++++++++++++++++++++
 gtk/gtkwindowcontrols.h              |  54 +++
 gtk/meson.build                      |   2 +
 gtk/theme/Adwaita/_common.scss       |  81 ++--
 testsuite/gtk/notify.c               |   4 +-
 10 files changed, 872 insertions(+), 445 deletions(-)
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