[gtkmm: 3/3] Merge branch 'wip/dboles/make_managed-4' into 'master'

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 4a82e56c2c0883f17f492f6592540582b07d89c3
Merge: cbab54c8 da95343a
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed Nov 7 13:37:35 2018 +0000

    Merge branch 'wip/dboles/make_managed-4' into 'master'
    
    object: Add Gtk::make_managed<T>(args...) helper [master]
    
    See merge request GNOME/gtkmm!5

 demos/gtk-demo/demowindow.cc                      | 20 ++++++--------------
 demos/gtk-demo/example_appwindow.cc               | 10 +++++-----
 demos/gtk-demo/example_buttonbox.cc               | 12 ++++++------
 demos/gtk-demo/example_change_display.cc          |  4 ++--
 demos/gtk-demo/example_dialog.cc                  |  2 +-
 demos/gtk-demo/example_flowbox.cc                 |  4 ++--
 demos/gtk-demo/example_iconbrowser.cc             |  2 +-
 demos/gtk-demo/example_images.cc                  | 16 ++++++++--------
 demos/gtk-demo/example_menus.cc                   | 20 ++++++++++----------
 demos/gtk-demo/example_panes.cc                   | 10 +++++-----
 demos/gtk-demo/example_sizegroup.cc               |  4 ++--
 demos/gtk-demo/example_stacksidebar.cc            |  4 ++--
 demos/gtk-demo/example_textview.cc                | 18 +++++++++---------
 demos/gtk-demo/example_treeview_editable_cells.cc |  4 ++--
 gtk/gtkmm/object.h                                | 21 +++++++++++++++++++++
 tests/child_widget_managed/main.cc                |  2 +-
 tests/delete_cpp_child/main.cc                    |  8 +++-----
 tests/dialog_deletethis/main.cc                   |  2 +-
 18 files changed, 87 insertions(+), 76 deletions(-)
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