Motivated by the EOL of Python 3.5 and the EOL of Ubuntu 16.04 next year
this requires Python 3.6 and moves all other dependencies to what is available in
Ubuntu 18.04.

It results in crashes downstream (pulls in a meson fallback in gst-ci)
and it isn't really needed, so revert for now.

Also Fedora only has 3.1 it turns out.

The GIL is now created by Python at initialization time no matter what.
PyEval_InitThreads() triggers a deprecation warning and will be removed in
3.10 so don't use it with 3.9+.

PyUnicode_GET_SIZE() is deprecated and actually wrong in case wchar_t
is not 4 bytes and high code points, use PyUnicode_GET_LENGTH() instead.

Fixes a deprecation warning with Python 3.9

This was required for Python 2 where Python didn't import our built modules
in the build dir because there is no __init__.py. In Python 3 this just works.

Tested with setup.py/pytest/meson

The newest lcov supports gcc 10 again. Also collect coverage
before the tests run as a baseline and add a config file so
every lcov call uses the same settings (taken on glib)

Tomas Hrnciar authored Nov 06, 2020 and Christoph Reiter committed Nov 11, 2020

Py_TYPE was changed to a function in Python 3.10. Suggested approach is
to use Py_SET_TYPE macro instead, see:
https://docs.python.org/3.10/whatsnew/3.10.html.

GFileIcon asserts that it gets a file now:
https://gitlab.gnome.org/GNOME/glib/-/commit/e2fbb74301

gtk4 calls get_dbus_object_path() on the default app and glib leaves
invalid GApplication instances as default in various places. It's hard
to track where a new default instances gets set, so just disable a11y
in the test suite for now.

Emmanuele Bassi authored Sep 11, 2020 and Christoph Reiter committed Nov 15, 2020

Similar to what the Gdk.py overrides do.

Emmanuele Bassi authored Sep 11, 2020 and Christoph Reiter committed Nov 15, 2020

The Container class does not exist any more.

Emmanuele Bassi authored Sep 11, 2020 and Christoph Reiter committed Nov 15, 2020

Drop all the deprecated compatibility layer for pygtk, and the
inheritance from GtkContainer.

Emmanuele Bassi authored Sep 11, 2020 and Christoph Reiter committed Nov 15, 2020

We don't need to override anything, once we drop the deprecated
compatibility layer for pygtk.

pack1/2 are gone

We'll get back to them later

skip template/builder tests for now as they require larger changes

Basically everything where we hav a transition path that works for
both gtk3 and 4. We'll need to add new deprecation warnings for gtk3
once things have settled down.

GTK4 removed the Gtk.Container interface, and added API on Gtk.Widget
to iterate over children instead.

Making Widgets iterable allows to easily loop over the children and
check is a widget is a child of an other one.

A new test is also added.

The examples don't work with gtk4 so set the proper version

This function use CompareDataFunc which works with pointers and
doesn't know anything about GObjects.

The same logic as in Gio.List.sort and Gio.List.insert_sorted is
used.

An associated unit_test is also added.

Gtk.Widget.set_connect_func() does not exist anymore and signals are
automatically connected. Instead, a GtkBuilderScope needs to be used
to create GtkBuilder's closure functions.

pygobject closure support is extended to support
functools.partial. This is used to create a GtkBuilder closure
function with an object different from the current object.

See MR https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/1204 and
https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/1230

Closes: #380

This is a follow of the previous commit which fixes template support
in GTK4 by adding GtkBuilerScope. It is extended to support a scope
object (it can be a python object or a dictionnary). This scope object
is used to define the scope the builder should operate in. A new
GtkBuilder constructor is introduced to be able to define this scope
object.

Swapped defaults to TRUE when object is set.

In GTK4, the margin property does not exist anymore. Replace it by the
margin-top property.

GTK4 removed the Gtk.Container interface. All GTK4 widgets are now
iterable.

Since 2.68 Gio.File.new_for_path("") returns a GDummyFile instead of
a GLocalFile. We don't really care since we just want to test that there
is a name despite the type not being in the gir, so just pass a potentially
valid path instead.

In a4880dbc a special case for partial() was added to handle gtk4 template
callbacks. This in turn broken normal usage of partial objects.

To work around that add a special marker in the gtk template code for now until
we find a better fix.

Also adds a test so this doesn't happen again.

Fixes #464