[chronojump] Force sensor capture top/bottom margins better

[Xavier de Blas <xaviblas src gnome org>]

commit e05b2b95422476656c8bae588c8b294e6faadfb8
Author: Xavier de Blas <xaviblas gmail com>
Date:   Wed Feb 12 19:06:36 2020 +0100

    Force sensor capture top/bottom margins better

 src/forceSensor.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/forceSensor.cs b/src/forceSensor.cs
index 2a7c366e..d8fbdb1d 100644
--- a/src/forceSensor.cs
+++ b/src/forceSensor.cs
@@ -921,14 +921,14 @@ public class ForceSensorCapturePoints
                        outsideGraph = true;
                }
 
-               if(p.Y < 0)
+               if(p.Y < marginTop)
                {
                        //too drastic change that makes DrawingArea empty at capture
                        //RealHeightG *= 2;
                        RealHeightG += 20;
                        outsideGraph = true;
                }
-               else if(p.Y > heightG)
+               else if(p.Y > heightG - marginBottom)
                {
                        //too drastic change that makes DrawingArea empty at capture
                        //RealHeightGNeg *= 2;