2.21.8.1 (unstable): Gtk: * IconView: Added tooltip-column and reorderable and item-padding properties. * MessageDialog: Added message-area properties. * TextBuffer: Added get_copy_target_list() and get_paste_target_list(). * AlignmentEnum: Add ALIGN_START and ALIGN_END to match gtkmm 3, to help future porting. * Improved API reference documentation.