[hyena/gtk3] ListView: unsubscribe from ValueChanged event in adjustment setters

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 51ddfdaff0c4ac0ffbb2ce8bde41c2c4a03746e0
Author: Andrés G. Aragoneses <knocte gmail com>
Date:   Sat Aug 24 12:06:17 2013 +0200

    ListView: unsubscribe from ValueChanged event in adjustment setters
    
    Otherwise the previous adjustments presumably could not be garbage
    collected.

 .../ListView/ListView_Interaction.cs               |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Interaction.cs 
b/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Interaction.cs
index f41480e..cc7ecb3 100644
--- a/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Interaction.cs
+++ b/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Interaction.cs
@@ -82,6 +82,9 @@ namespace Hyena.Data.Gui
                 if (value == vadjustment) {
                     return;
                 }
+                if (vadjustment != null) {
+                    vadjustment.ValueChanged -= OnVadjustmentChanged;
+                }
                 vadjustment = value;
                 vadjustment.ValueChanged += OnVadjustmentChanged;
                 UpdateAdjustments ();
@@ -95,6 +98,9 @@ namespace Hyena.Data.Gui
                 if (value == hadjustment) {
                     return;
                 }
+                if (hadjustment != null) {
+                    hadjustment.ValueChanged -= OnHadjustmentChanged;
+                }
                 hadjustment = value;
                 hadjustment.ValueChanged += OnHadjustmentChanged;
                 UpdateAdjustments ();