[pitivi] viewer: Do not ignore the minimum size requested by the super class

[Alexandru Băluț <alexbalut src gnome org>]

commit ef39f7cb5cde42ddfe26f8d63655e9b189d261e3
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Mon Jun 27 15:57:30 2016 +0200

    viewer: Do not ignore the minimum size requested by the super class
    
    Fixes the following warning printed in the console:
    Gtk-WARNING **: Negative content width -1 (allocation 1, extents 1x1) while allocating gadget (node 
border, owner pitivi+viewer+viewer+ViewerWidget)
    
    Differential Revision: https://phabricator.freedesktop.org/D1134

 pitivi/viewer/viewer.py |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/pitivi/viewer/viewer.py b/pitivi/viewer/viewer.py
index 3edcfff..e02b012 100644
--- a/pitivi/viewer/viewer.py
+++ b/pitivi/viewer/viewer.py
@@ -493,16 +493,16 @@ class ViewerWidget(Gtk.AspectFrame, Loggable):
         self.set_property("ratio", float(ratio))
 
     def do_get_preferred_width(self):
-        Gtk.AspectFrame.do_get_preferred_width(self)
+        mininum, unused_natural = Gtk.AspectFrame.do_get_preferred_width(self)
         # Do not let a chance for Gtk to choose video natural size
         # as we want to have full control
-        return 0, 1
+        return mininum, mininum + 1
 
     def do_get_preferred_height(self):
-        Gtk.AspectFrame.do_get_preferred_height(self)
+        mininum, unused_natural = Gtk.AspectFrame.do_get_preferred_height(self)
         # Do not let a chance for Gtk to choose video natural size
         # as we want to have full control
-        return 0, 1
+        return mininum, mininum + 1
 
 
 class PlayPauseButton(Gtk.Button, Loggable):