[gtk: 7/7] Merge branch 'wip/exalm/headerbar-dragging' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit eae4a194b854b7d7a65b0a0b9e7546ef4a24c261
Merge: f693da148e 8d24711567
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 10 18:15:57 2020 +0000

    Merge branch 'wip/exalm/headerbar-dragging' into 'master'
    
    Extract GtkWindow dragging and titlebar actions
    
    Closes #2689
    
    See merge request GNOME/gtk!1814

 docs/reference/gtk/gtk4-docs.xml          |   1 +
 docs/reference/gtk/gtk4-sections.txt      |  18 +
 docs/reference/gtk/gtk4.types.in          |   1 +
 gtk/gtk.h                                 |   1 +
 gtk/gtkheaderbar.c                        |  74 ++--
 gtk/gtkwidget.c                           |   7 +-
 gtk/gtkwidgetprivate.h                    |   5 +-
 gtk/gtkwindow.c                           | 540 +----------------------
 gtk/gtkwindowhandle.c                     | 687 ++++++++++++++++++++++++++++++
 gtk/gtkwindowhandle.h                     |  44 ++
 gtk/meson.build                           |   2 +
 gtk/theme/Adwaita/_common.scss            |   4 +-
 testsuite/css/style/bloomfilter-not.nodes |  24 +-
 13 files changed, 833 insertions(+), 575 deletions(-)
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