[longomatch] Fix video window visibility issue on Windows when reparenting

[Andoni Morales Alastruey <amorales src gnome org>]

commit c2206fc0030ec82d81eb269a5b3fafe562fb3c9e
Author: Julien Moutte <julien fluendo com>
Date:   Thu Oct 23 17:53:51 2014 +0200

    Fix video window visibility issue on Windows when reparenting

 LongoMatch.GUI.Multimedia/Gui/VideoWindow.cs |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/LongoMatch.GUI.Multimedia/Gui/VideoWindow.cs b/LongoMatch.GUI.Multimedia/Gui/VideoWindow.cs
index 936b185..c613f30 100644
--- a/LongoMatch.GUI.Multimedia/Gui/VideoWindow.cs
+++ b/LongoMatch.GUI.Multimedia/Gui/VideoWindow.cs
@@ -41,6 +41,8 @@ namespace LongoMatch.Gui
                        videoeventbox.ButtonPressEvent += HandleButtonPressEvent;
                        videoeventbox.ScrollEvent += HandleScrollEvent;
                        videoeventbox.BorderWidth = 0;
+                       // This is required to avoid video window visibility issues on Windows.
+                       videoeventbox.VisibleWindow = false;
 
                        frame.Add (Window);
                        videoeventbox.Add (frame);