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We must not add class interfaces after g_type_class_ref() has been called the
first time. Move signal and property creation from pyg_type_register() into
pyg_object_class_init(), and drop the hack of registering interfaces twice.

This changed class initialization order now exposes GLib's warning about
unknown signals, so adjust test_signal.TestGSignalsError.test_invalid_name() to
not abort on that.

https://bugzilla.gnome.org/show_bug.cgi?id=686149

PYGLIB_*_VERSION are not used anywhere any more, remove those.
(dropped in commit 8d52bceb)

We already require a new enough glib version as we dropped g_thread_init() in
the main code a long time ago. But for formality's sake, bump glib requirement
to >= 2.32.

Clear out TYPE constants from _gobject/__init__.py and move them into the
GObject overrides. Disperse class imports among modules that use them instead
of using _gobject/__init__.py as a staging area (e.g. GInterface).

https://bugzilla.gnome.org/show_bug.cgi?id=687487

These really ought to come from GLib's typelib, but are not right now so we
need to keep the static bindings for those. But drop them from gi/_gobject/ and
move them into the overrides where they belong.

Drop static definitions of GLib.OPTION_* constants and use the ones from GI
instead.

https://bugzilla.gnome.org/show_bug.cgi?id=686765

Use assertRaisesRegex() instead and provide 2.7 compatibility in
tests/runtests.py.

Replace the following functions with gi and overrides:
type_children, type_interfaces, signal_list_ids, signal_list_names,
signal_lookup, signal_name, type_parent. Assign SIGNAL_* and
PARAM_* from gi SignalFlags and ParamFlags respectively.
Move module level assignments of a number of static functions to
the GObject.py overrides file.

https://bugzilla.gnome.org/show_bug.cgi?id=687487

Add expected failure test for invalid SystemError's coming from
signal_lookup and signal_list_ids. Remove excessive type_name
tests and type_from_name tests.

https://bugzilla.gnome.org/show_bug.cgi?id=687487

Replace static GLib.filename_from_utf8() with GI. The old static binding always
tried to convert the result to an Unicode object, which will fail if the result
is not UTF-8 encoded (which is the whole point of this function really!), so
return bytes now.

Although the static binding was rather useless before, this is technically an
API break.

Use the GLib version from GI instead, and the already existing gi.version_info.

Use the introspected constants from GLib instead.

Related to https://bugzilla.gnome.org/show_bug.cgi?id=685022

Replace our custom code with a call to the corresponding gobject-instrospection
function.

https://bugzilla.gnome.org/show_bug.cgi?id=687371

Factorize the logic to handle zero or multiple user_data arguments into
user_data_varargs_shim(), and put code that handles deprecated API into the
corresponding "then" branches, to improve readability.

Re-fix the acceptance of priority as first argument for idle_add(),
io_add_watch() and timeout_add(), as that is the real GLib API. Ensure that
this keeps supporting the backwards compatible API with supplying multiple user
data arguments.

https://bugzilla.gnome.org/show_bug.cgi?id=687047

Add tests for the following methods: signal_list_ids,
signal_name, signal_lookup, signal_query, type_children,
type_from_name, type_name, type_is_a, and type_interfaces.

https://bugzilla.gnome.org/show_bug.cgi?id=687487

Change idle_add, timeout_add, timeout_add_seconds, and
io_add_watch to accept *args and **kwargs as arguments
to the callback functions instead of only accepting a single
user_data arg. This ensures the new overridden introspection
methods are backwards compatible with the static versions
they replaced.

https://bugzilla.gnome.org/show_bug.cgi?id=687047

Use __future__ unicode_literals to minimize difference
between python 2.7 and 3. Comparisons need to encode arguments as
'UTF-8' for testing readline operations.
Add backwards compatible "next" to support the python 2.7 iteration.
Change isinstance(channel, file) to hasattr(channel, 'fileno') to
support all python versions (and duck typing).

https://bugzilla.gnome.org/show_bug.cgi?id=687047

The old static bindings allowed that, so we need to allow it to maintain
backwards compatibility. Deprecate this mode as well, so that we can get rid of
it at some point.

https://bugzilla.gnome.org/show_bug.cgi?id=687047

Use GLib.get_real_time() through GI instead. Deprecate the function, as
GLib.get_real_time() should be called directly.

Check spawn_async() with getting stdin/out/err pipes and specifying envp.

Use the GLib API through GI instead, and provide override to keep backwards
compatible API. Also allow using the actual GLib API, and deprecate the old
static API of calling without a priority as first argument.

Verify that priority is set correctly, and also test calling without userdata.

It was complaining about finding only 1 blank line.  Regression
likely introduced by f976d05b.

https://bugzilla.gnome.org/show_bug.cgi?id=686991

DeprecationWarning is not shown by default, and is thus rather useless for
developers. Use a custom PyGIDeprecationWarning class and derive it from
RuntimeWarning to make it visible.

Use the GLib API through GI instead, and provide override to keep backwards
compatible API. Also allow using the actual GLib API, and deprecate all other
variants:
 - calling with an fd as first argument instead of an IOChannel
 - calling without a priority as second argument

Use the GLib API through GI instead, and provide overrides to keep backwards
compatible API, including its bugs.

We still need to keep a static wrapper around g_io_channel_read_chars() until
we teach PyGObject to correctly handle caller allocated out array arguments.

https://bugzilla.gnome.org/show_bug.cgi?id=686795

~GLib.IOFlags.NONBLOCK yields an int instead of a GLib.IOFlags, so ensure that
the result is of type GLib.IOFlags again.

pep8 takes quite long for "make check". Skip it if $SKIP_PEP8 is set, which
makes the test/fix turnaround time faster.

Add gi.module.get_introspection_module to explicitly get a
wrapped module pulled in through introspection without static
and python override handling. This API is intended for python
overrides to use rather than having them access
gi.importer.modules['<name>']._introspection_module directly.
Replace aforementioned usage in all overrides.

https://bugzilla.gnome.org/show_bug.cgi?id=686828

Use GLib.option, not gi._glib.option.

Use the introspected constants instead, which are identical. Add backwards
compatible aliases.

These constants are covered by tests/test_subprocess.py.

https://bugzilla.gnome.org/show_bug.cgi?id=686765

Use the introspected constants instead, which are identical. Add backwards
compatible aliases.

These constants are covered by tests/test_iochannel.py.

- Fix segfault when using an IOChannel as an iterator: PyIter_Next() returns
  NULL on the last element, instead of raising a StopIteration.

- The default encoding of a stream is 'UTF-8', not NULL. NULL means that the
  stream is being used in binary mode; in that case, we should not attempt to
  do any automagic conversion to an Unicode object. As this special case is
  inconsistent and has never worked anyway, and the current buggy
  implementation breaks binary streams, just drop it without replacement.
  (Introduced in commit de9eae4d)

These bugs were uncovered by the previously committed tests.