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Examples derived from tests/test_gtk_template.py.

Up until now this raised an exception "This method is currently unsupported.".

With Gtk.Widget.destroy() gone in gtk4 and that method often being used to remove
references to other objects and breaking cycles this is the next best thing
on a lower level and should make porting a bit easier.

Fixes #470

The meson_options.txt file uses the "feature" option which was
introduced in 0.47.0.

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

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.

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

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

Swapped defaults to TRUE when object is set.

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.

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 gtk!1204 and
gtk!1230

Closes: #380

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.

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

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.

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.

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

We'll get back to them later

pack1/2 are gone

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

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

The Container class does not exist any more.

Similar to what the Gdk.py overrides do.

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.

GFileIcon asserts that it gets a file now:
glib@e2fbb743

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.

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)