[chronojump] ForceSensor export can be cancelled ok since new code

[Xavier de Blas <xaviblas src gnome org>]

commit b2b61d286e34b393a12df0e7821bfc402c376bf7
Author: Xavier de Blas <xaviblas gmail com>
Date:   Tue Feb 9 19:30:48 2021 +0100

    ForceSensor export can be cancelled ok since new code

 src/forceSensor.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/forceSensor.cs b/src/forceSensor.cs
index 8e70fea4..021eef60 100644
--- a/src/forceSensor.cs
+++ b/src/forceSensor.cs
@@ -2537,9 +2537,12 @@ public class ForceSensorExport
                }
 
                LogB.Information("Waiting creation of file... ");
-               while ( ! ( Util.FileReadable(UtilEncoder.GetmifExportFileName())))
+               while ( ! ( Util.FileReadable(UtilEncoder.GetmifExportFileName()) || cancel ) )
                        ;
 
+               if(cancel)
+                       return false;
+
                File.Copy(UtilEncoder.GetmifExportFileName(), exportFilename, true);
 
                /*