[pitivi] render: Update encoding properties combo boxes when setting encoding targets

[Thibault Saunier <tsaunier src gnome org>]

commit 1a28d19e67e83de3e679d3ae0c8651f9d04ceb49
Author: Thibault Saunier <tsaunier gnome org>
Date:   Wed Jul 26 13:23:16 2017 -0400

    render: Update encoding properties combo boxes when setting encoding targets
    
    Reviewed-by: Alex Băluț <<alexandru balut gmail com>>
    Differential Revision: https://phabricator.freedesktop.org/D1809

 pitivi/render.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/render.py b/pitivi/render.py
index f00a1bc..0756661 100644
--- a/pitivi/render.py
+++ b/pitivi/render.py
@@ -487,6 +487,8 @@ class RenderDialog(Loggable):
             return
 
         self.updateAvailableEncoders()
+        self._update_valid_audio_restrictions(Gst.ElementFactory.find(self.project.aencoder))
+        self._update_valid_video_restrictions(Gst.ElementFactory.find(self.project.vencoder))
         for i, (combo, name, value) in enumerate([
                 (self.audio_encoder_combo, "aencoder", factory("aencoder")),
                 (self.video_encoder_combo, "vencoder", factory("vencoder")),