[longomatch] Forbid negative values for the needle object

[Andoni Morales Alastruey <amorales src gnome org>]

commit e8eadd41487851ee9160c9b2ed0a230708818725
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Tue Mar 31 10:50:36 2015 +0200

    Forbid negative values for the needle object

 LongoMatch.Drawing/CanvasObjects/NeedleObject.cs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/LongoMatch.Drawing/CanvasObjects/NeedleObject.cs 
b/LongoMatch.Drawing/CanvasObjects/NeedleObject.cs
index 3bc74d2..25befb3 100644
--- a/LongoMatch.Drawing/CanvasObjects/NeedleObject.cs
+++ b/LongoMatch.Drawing/CanvasObjects/NeedleObject.cs
@@ -100,7 +100,7 @@ namespace LongoMatch.Drawing.CanvasObjects
                public void Move (Selection s, Point p, Point start)
                {
                        if (s.Position == SelectionPosition.All) {
-                               X = p.X;
+                               X = Math.Max (p.X, 0);
                        }
                }
        }