3.19.11:

Gtk:
* AccelLabel: Ad get_accel().
  (Kjell Ahlstedt)
* ApplicationWindow:
  * Add set/unset/get_help_overlay().
  (Kjell Ahlstedt)
* Builder: Make get_widget_derived() a variadic template,
  forwarding its arguments to the constructor of the derived class.
  (Kjell Ahlstedt) Bug #134161
* GestureLongPress: Add property_delay_factor().
  (Kjell Ahlstedt)
* Popover: Add PopoverConstraint enum and
  set/get/property_constrain_to().
    (Kjell Ahlstedt)
* Range: Deprecate get/set_min_slider_size().
  (Murray Cumming)
* Stack: Add set/get/property_interpolate_size().
  (Kjell Ahlstedt)
* StackSwitcher: Add property_icon_size().
  (Kjell Ahlstedt)
* Settings: Add reset_property() and
  property_gtk_titlebar_double_click/middle_click/right_click().
  (Kjell Ahlstedt)
* Add Shortcuts* widgets, such as ShortcutsWindow.
  (Kjell Ahlstedt)
* TextTag: Add tag_changed() and property_strikethrough_rgba/
  strikethrough_rgba_set/underline_rgba/underline_rgba_set/font_features/
  font_features_set().
  (Kjell Ahlstedt)
* TextView: Add set/get/property_top_margin() and 
  set/get/property_bottom_margin().
  (Kjell Ahlstedt)
* Replace deprecated Glib::ScopedPtr with make_unique_g_free().
  (Murray Cumming)

Gdk:
* Add GLContext::is_legacy().
  (Kjell Ahlstedt)
* Seat: Add get_slaves()
  (Kjell Ahlstedt) Bug #759806
* Window: Deprecate parse_geometry() and set_default_geometry().
  (Kjell Ahlstedt)

Documentation:
* Add Shortcuts Window demo.
  (Kjell Ahlstedt)
* treeview_editable_cells demo: Catch exception from std::stoi.
  (Kjell Ahlstedt)
* Misc: Mention non-deprecated get/set_margin_*() in docs.
  (Murray Cumming)
* Gdk::DeviceManager::get_client_pointer(): Update the deprecation message
  (Kjell Ahlstedt) Bug #759806.

Build:
* Visual Studio builds: Update gdkmm project for GdkSeat.
  (Chun-wei Fan)