[longomatch] Fix wrong offset usage.

[Andoni Morales Alastruey <amorales src gnome org>]

commit d370fdea9939db829b2f70357d08d1ec6e616a82
Author: Julien Moutte <julien fluendo com>
Date:   Sat Mar 14 13:49:37 2015 +0100

    Fix wrong offset usage.
    
    TimeNode.Start equals  - Offset.

 LongoMatch.Drawing/Widgets/CamerasTimeline.cs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/LongoMatch.Drawing/Widgets/CamerasTimeline.cs b/LongoMatch.Drawing/Widgets/CamerasTimeline.cs
index 5c10064..c389c10 100644
--- a/LongoMatch.Drawing/Widgets/CamerasTimeline.cs
+++ b/LongoMatch.Drawing/Widgets/CamerasTimeline.cs
@@ -149,7 +149,7 @@ namespace LongoMatch.Drawing.Widgets
                                if (CameraDragged != null) {
                                        CameraObject co = sel.Drawable as CameraObject;
                                        // Adjust offset
-                                       co.MediaFile.Offset = co.TimeNode.Start;
+                                       co.MediaFile.Offset = new Time (-co.TimeNode.Start.MSeconds);
                                        // And notify
                                        CameraDragged (co.MediaFile, co.TimeNode);
                                }