2.53.1.1 (unstable):

Glib:
* Use C++11 enum classes instead of old-style enums, and put many enums
  inside relevant class declarations:
  - Glib::NodeTree: Move enums into class.
  - Glib::BindingFlags is now Glib::Binding::Flags.
  - Glib::KeyfileFlags is now Glib::Keyfile::Flags.
  - Glib::ModuleFlags is now Glib::Module::Flags.
  - Glib::ChecksumType is now Glib::Checksum::Type.
  - Glib::Regex: Move enums inside class.
  - Glib::Resource: Move enums into class.
  (Murray Cumming, Kjell Ahlstedt)
* RefPtr: Make this an alias for std::shared_ptr<> instead.
  - Use std::dynamic_pointer_cast<>() instead of RefPtr<>::cast_dynamic().
  - Use std::static_pointer_cast<>() instead of RefPtr<>::cast_static().
  - Use std::const_pointer_cast<>() instead of RefPtr<>::cast_const().
  - When creating RefPtr directly, instead of using create() methods,
    use Glib::make_refptr_for_instance() so the std::shared_ptr<> has the
    necessary Deleter.
  (Murray Cumming) Bug #755037
* Remove Glib::WeakRef. Use std::weak_ref<> instead.
  (Murray Cumming) Bug #755037
* Object: Use g_object_new_with_properties() instead of (deprecated)
  g_object_newv() and (deprecated) GParameter.
  (Murray Cumming)
* IOChannel: Avoid creating a RefPtr to this.
  (Murray Cumming) Bug #755037
* SignalProxy:
  connect(): Signals with non-void return values now have no default value
  for the "after" parameter, forcing application developers to think about
  whether they should connect before or after already-connected signal
  handlers, and default signal handlers. This is awkward but necessary.
  Just provide "true" to get the previous behaviour, or use connect_notify().
  connect_notify(): Signals with void return values have no connect_notify(),
  because it is not useful with those signals.
  (Kjell Ahlstedt) Bug #126213.

Gio:
* Use C++11 enum classes instead of old-style enums, and put many enums
  inside relevant class declarations:
  - Gio::Drive: Move enums into class.
  - Gio::TlsDatabase: Move enums into class.
  - Gio::UnixSocketAddressType is now Gio::UnixSocketAddress::Type.
  - Gio::Mount: Move enums into class.
  - Gio::TlsPasswordFlags is now Gio::TlsPassword::Flags.
  - Gio::IOStreamSpliceFlags is now Gio::IOStream::SpliceFlags.
  - Gio::SettingsBindFlags is now Gio::Settings::BindFlags.
  - Gio::ResolverRecordType is now Gio::Resolver::RecordType.
  - Gio::Socket: Move enums into class.
  - Gio::File: Move some flags enums into the class.
  - Gio::OutputStreamSpliceFlags is now Gio::OuputStream::SpliceFlags.
  - Gio::CredentialsType is now Gio::Credentials::Type.
  - Gio::NotificationPriority is now Gio::Notification::Priority.
  - Gio::FileMonitorEvent is now Gio::FileMonitor::Event.
  - Gio::FileAttributeInfoFlags is now Gio::FileAttributeInfo::Flags.
  - Gio::EmblemOrigin is now Gio::Emblem::Origin.
  - Gio::Converter: Put enums inside class.
  - Gio::ConverterFlags is now Gio::Converter::Flags.
  - Gio::ConverterResult is now Gio::Converter::Result.
  - Gio::AppInfoCreateFlags is now Gio::AppInfo::CreateFlags.
  - Gio::ApplicationFlags is now Gio::Application::Flags.
  (Murray Cumming, Kjell Ahlstedt)
* Remove duplicate ErrorEnum declaration.
  (Kjell Ahlstedt)
* ConstructParams:
  - Remove (hopefully really unnecessary) copy constructor.
  - C++11: =delete the operator=, instead of making it private.
  (Murray Cumming)
* Value:
  - Remove the CType alias, which should be unnecessary.
  - value_custom: Replace a template parameter with C++11 type traits.
  - Value<RefPtr<T>>: Only use this specialization if T has get_base_type().
  (Murray Cumming) Bug #755037
* Variant:
  - operator bool(): Simplify to avoid clang++ warnings.
  - C++11: Variant: Replace throw(std::bad_cast) with noexcept(false).
    See https://bugzilla.redhat.com/show_bug.cgi?id=1438766
  (Murray Cumming)
* Socket: Avoid creating a RefPtr to this.
  (Murray Cumming) Bug #755037

Gio:DBus:
* Use C++11 enum classes instead of old-style enums, and put many enums
  inside relevant class declarations:
  - Gio::DBus::InterfaceSkeletonFlags is now Gio::DBus::InterfaceSkeleton::Flags.
  - Gio::DBus::ServerFlags is now Gio::DBus::Server::Flags.
  (Murray Cumming, Kjell Ahlstedt)

gmmproc:
* _WRAP_ENUM(): Generate C++ enum classes instead of enums, and let the enums
  be inside class declarations.
  (Kjell Ahlstedt) Bug #86864

Build
* Windows:  Visual Studio builds: Update ABI version
  (Chun-wei Fan)


2.53.1 (unstable):

Glib:
* OptionGroup:
  - Don't allow copy or move.
  - Remove the OptionGroup& parameter in on_pre_parse(), on_post_parse() and
    on_error().
  (Kjell Ahlstedt)
* IOChannel, StreamIOChannel: Remove deprecated parts.
  (Kjell Ahlstedt)
* ustring: Add make_valid().
  (Krzysztof Piecuch) Bug #780075
* Remove (unused) Sequence and sequence().
  (Murray Cumming)
* Remove ListHandle, SListHandle, ArrayHandle, SArrayHandle, and
  StringArrayHandle, replacing them with std::vector in API.
  (Murray Cumming)

gmmproc:
* _WRAP_METHOD(): Some more use of auto in generated code.
  (Murray Cumming)

Build:
* Change the ABI to glibmm-2.54.
  (Murray Cumming)
* Add some #include directives.
  (Kjell Ahlstedt)
* Visual Studio: Require Visual Studio 2017 and update the glibmm project.
  (Chu-wei Fan)