[chronojump] Force sensor analyze move AB does not mess up on multi movements

[Xavier de Blas <xaviblas src gnome org>]

commit 86152358d1c23d349a7969acf17ebef5b89b62c2
Author: Xavier de Blas <xaviblas gmail com>
Date:   Wed May 13 11:40:02 2020 +0200

    Force sensor analyze move AB does not mess up on multi movements

 src/gui/app1/forceSensorAnalyze.cs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/src/gui/app1/forceSensorAnalyze.cs b/src/gui/app1/forceSensorAnalyze.cs
index 985e2577..42a3a545 100644
--- a/src/gui/app1/forceSensorAnalyze.cs
+++ b/src/gui/app1/forceSensorAnalyze.cs
@@ -1474,8 +1474,19 @@ public partial class ChronoJumpWindow
                                        ( difference < 0 && aValue > 1 && bValue > 1 ) )
                        {
                                //move a and b
-                               hscale_force_sensor_ai_a.Value += difference;
-                               hscale_force_sensor_ai_b.Value += difference;
+                               /*
+                                * if we move to the right and first we move a
+                                * on moving a, maybe a >= b so on_hscale_force_sensor_ai_a_value_changed 
will make b = a
+                                * and then the on_hscale_force_sensor_ai_ab_value_changed will move also b.
+                                * For this reason when we go to the right, first we move b
+                                */
+                               if(difference > 0) {
+                                       hscale_force_sensor_ai_b.Value += difference;
+                                       hscale_force_sensor_ai_a.Value += difference;
+                               } else {
+                                       hscale_force_sensor_ai_a.Value += difference;
+                                       hscale_force_sensor_ai_b.Value += difference;
+                               }
                        } else {
                                //do not move ab (so also a and b will not be moved)
                                updateForceSensorHScales = false;