[gtkmm] Box::pack_start():pack_end(options): Set expand/align for both h and v.

[Murray Cumming <murrayc src gnome org>]

commit ece3794336e7216c4d25484be432d5d142ebab1b
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Apr 28 14:13:31 2017 +0200

    Box::pack_start():pack_end(options): Set expand/align for both h and v.
    
    Because we think that is what the old expand and fill parameters did.

 gtk/src/box.ccg |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtk/src/box.ccg b/gtk/src/box.ccg
index 293b181..218ca43 100644
--- a/gtk/src/box.ccg
+++ b/gtk/src/box.ccg
@@ -29,7 +29,9 @@ void Box::pack_start(Widget& child, PackOptions options)
   const bool fill = (options == PackOptions::EXPAND_WIDGET);
 
   child.property_hexpand() = expand;
+  child.property_vexpand() = expand;
   child.property_halign() = fill ? Gtk::Align::FILL : Gtk::Align::START;
+  child.property_valign() = fill ? Gtk::Align::FILL : Gtk::Align::START;
 
   gtk_box_pack_start(gobj(), child.gobj());
 }
@@ -40,7 +42,9 @@ void Box::pack_end(Widget& child, PackOptions options)
   const bool fill = (options == PackOptions::EXPAND_WIDGET);
 
   child.property_hexpand() = expand;
+  child.property_vexpand() = expand;
   child.property_halign() = fill ? Gtk::Align::FILL : Gtk::Align::END;
+  child.property_valign() = fill ? Gtk::Align::FILL : Gtk::Align::END;
 
   gtk_box_pack_end(gobj(), child.gobj());
 }