[gtkmm] 3.21.6

[Murray Cumming <murrayc src gnome org>]

commit 992523cd51eb721efac831ea91ce9bd2c7ae6fe3
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Sep 14 09:31:36 2016 +0200

    3.21.6

 NEWS         |   36 ++++++++++++++++++++++++++++++++++++
 configure.ac |    4 ++--
 2 files changed, 38 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 7217c7f..7b9d8d7 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,39 @@
+3.21.6:
+
+Gtk:
+* FileChooser: Added add_choice(), remove_choice(), set_choice(), get_choice().
+  (Kjell Ahlstedt)
+* Menu: Add popup_at_rect(), popup_at_widget(), popup_at_pointer(),
+  signal_popped_up(), and the anchor_hints, rect_anchor_dx, rect_anchor_dy,
+  and menu_type_hint properties.
+  (Kjell Ahlstedt)
+* Popover: Add popup() and popupdown(),
+  deprecating get/set_transitions_enabled().
+  (Murray Cumming)
+* RadioMenuItem, RadioToolButton: Add join_group().
+  (Kjell Ahlstedt) Bug #769374
+* ScrolledWindow:
+  - Added get/set_max_content_height/width()
+  and properties.
+  (Kjell Ahlstedt)
+  - Added get/set_propagate_natural_height/width()
+  and the properties.
+  (Murray Cumming)
+* Add the ShortcutLabel widget.
+  (Kjell Ahlstedt)
+* TreeNodeChildren: Deprecate the reverse iterator.
+  (Kjell Ahlstedt) Bug #554889 (Pavelo)
+
+Gdk:
+* Pixbuf: Added set_option(), remove_option(), and copy_options().
+  (Murray Cumming)
+* PixbufFormat: Added is_save_option_supported().
+  (Murray Cumming)
+
+Documentation:
+* Gtk::Clipboard::wait_for_uris(): Fix the documentation
+   (Kjell Ahlstedt)
+
 3.21.4 (unstable):
 
 Gtk:
diff --git a/configure.ac b/configure.ac
index 1f8c0cc..42b593f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,7 +15,7 @@
 ## You should have received a copy of the GNU Lesser General Public License
 ## along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
-AC_INIT([gtkmm], [3.21.4],
+AC_INIT([gtkmm], [3.21.6],
         [http://bugzilla.gnome.org/enter_bug.cgi?product=gtkmm],
         [gtkmm], [http://www.gtkmm.org/])
 AC_PREREQ([2.59])
@@ -95,7 +95,7 @@ AS_IF([test "x$enable_static" = xyes],
 # gdkmm really does need GTK+, because part of Gdk::DragContext is in GTK+.
 # The extra cairomm-1.0 check is because gdkmm requires a newer cairomm than pangomm requires.
 # The extra gdk-pixbuf-2.0 check is because gdkmm requires a newer gdk-pixbuf than gtk+-3.0 requires.
-AC_SUBST([GDKMM_MODULES], ['giomm-2.4 >= 2.49.1 pangomm-1.4 >= 2.38.2 gtk+-3.0 >= 3.21.4 cairomm-1.0 >= 
1.12.0 gdk-pixbuf-2.0 >= 2.35.5'])
+AC_SUBST([GDKMM_MODULES], ['giomm-2.4 >= 2.49.1 pangomm-1.4 >= 2.38.2 gtk+-3.0 >= 3.21.6 cairomm-1.0 >= 
1.12.0 gdk-pixbuf-2.0 >= 2.35.5'])
 
 AS_IF([test "x$gtkmm_host_windows" = xyes],
       [GTKMM_MODULES=$GDKMM_MODULES],