[chronojump] Ensure on adding a person never is shown more times on the treeview (by any rare mono thread stuff)

[Xavier de Blas <xaviblas src gnome org>]

commit 3aa46e86994b232e242c021423fe34099163f95d
Author: Xavier de Blas <xaviblas gmail com>
Date:   Wed Nov 29 21:00:04 2017 +0100

    Ensure on adding a person never is shown more times on the treeview (by any rare mono thread stuff)

 src/gui/chronojump.cs |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/gui/chronojump.cs b/src/gui/chronojump.cs
index bb4e37b..caadb82 100644
--- a/src/gui/chronojump.cs
+++ b/src/gui/chronojump.cs
@@ -2567,11 +2567,13 @@ public partial class ChronoJumpWindow
                //-1 means we are adding a new person
                //if we were modifying it will be it's uniqueID
                
+               personAddModifyWin.FakeButtonAccept.Clicked -= new 
EventHandler(on_person_add_single_accepted);
                personAddModifyWin.FakeButtonAccept.Clicked += new 
EventHandler(on_person_add_single_accepted);
        }
        
        private void on_person_add_single_accepted (object o, EventArgs args)
        {
+               personAddModifyWin.FakeButtonAccept.Clicked -= new 
EventHandler(on_person_add_single_accepted);
                if (personAddModifyWin.CurrentPerson != null)
                {
                        currentPerson = personAddModifyWin.CurrentPerson;