[chronojump] Minor fix

[Xavier de Blas <xaviblas src gnome org>]

commit 5365bf2c26accffe4a1a0e6010e2f404307faca7
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Jun 18 23:13:14 2015 +0200

    Minor fix

 src/gui/encoderConfiguration.cs |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)
---
diff --git a/src/gui/encoderConfiguration.cs b/src/gui/encoderConfiguration.cs
index 9c128a8..67461d9 100644
--- a/src/gui/encoderConfiguration.cs
+++ b/src/gui/encoderConfiguration.cs
@@ -175,30 +175,35 @@ public class EncoderConfigurationWindow
        private void initializeList(Constants.EncoderType type, bool inertial, int position) {
                list = UtilEncoder.EncoderConfigurationList(type, inertial);
 
-               button_previous.Sensitive = (list.Count > 1);
-               button_next.Sensitive = (list.Count > 1);
-                       
                listCurrent = position; //current item on list
                
+               buttons_previous_next_sensitive();
                selectedModeChanged();
        }
        
        private void on_button_previous_clicked (object o, EventArgs args) {
                listCurrent --;
                if(listCurrent < 0)
-                       listCurrent = list.Count -1;
+                       listCurrent = 0;
                
+               buttons_previous_next_sensitive();
                selectedModeChanged();
        }
 
        private void on_button_next_clicked (object o, EventArgs args) {
                listCurrent ++;
                if(listCurrent > list.Count -1)
-                       listCurrent = 0;
-
+                       listCurrent = list.Count -1;
+               
+               buttons_previous_next_sensitive();
                selectedModeChanged();
        }
 
+       private void buttons_previous_next_sensitive() {
+               button_previous.Sensitive = (listCurrent > 0);
+               button_next.Sensitive = (listCurrent < list.Count -1);
+       }
+
        private void selectedModeChanged() {
                EncoderConfiguration ec = (EncoderConfiguration) list[listCurrent];