[pitivi] Avoid using deprecated APIs

[Thibault Saunier <tsaunier src gnome org>]

commit 77def3904fd525c1949dfe3099d3902dc91cdf1d
Author: Thibault Saunier <tsaunier gnome org>
Date:   Tue Nov 7 17:17:32 2017 -0300

    Avoid using deprecated APIs
    
    Reviewed-by: Alex Băluț <<alexandru balut gmail com>>
    Differential Revision: https://phabricator.freedesktop.org/D1878

 pitivi/check.py             |    7 +++++++
 pitivi/timeline/timeline.py |    2 +-
 2 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/check.py b/pitivi/check.py
index 4bac3a2..3cc7834 100644
--- a/pitivi/check.py
+++ b/pitivi/check.py
@@ -341,6 +341,11 @@ def initialize_modules():
     require_version("Gdk", GTK_API_VERSION)
     from gi.repository import Gdk
     Gdk.init([])
+    from gi.repository import Gtk
+
+    # Monkey patch deprecated methods to use the new variant by default
+    Gtk.Layout.get_vadjustment = Gtk.Scrollable.get_vadjustment
+    Gtk.Layout.get_hadjustment = Gtk.Scrollable.get_hadjustment
 
     if not gi.version_info >= (3, 11):
         from gi.repository import GObject
@@ -359,6 +364,8 @@ def initialize_modules():
     require_version("GES", GST_API_VERSION)
     from gi.repository import GES
     res, sys.argv = GES.init_check(sys.argv)
+    # Monkey patch deprecated methods to use the new variant by default
+    GES.TrackElement.list_children_properties = GES.TimelineElement.list_children_properties
 
     from pitivi.utils import validate
     if validate.init() and "--inspect-action-type" in sys.argv:
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index 3407f45..a3d02fc 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -1432,7 +1432,7 @@ class TimelineContainer(Gtk.Grid, Zoomable, Loggable):
     # Internal API
 
     def _createUi(self):
-        left_size_group = Gtk.SizeGroup(Gtk.SizeGroupMode.HORIZONTAL)
+        left_size_group = Gtk.SizeGroup.new(Gtk.SizeGroupMode.HORIZONTAL)
         zoom_box = ZoomBox(self)
         left_size_group.add_widget(zoom_box)