[hyena] [Hyena.Gui] Fix crash-causing race in ListViewAccessible

[Gabriel Burt <gburt src gnome org>]

commit 63670138b85f16318f71702d3da6b69775f81ae6
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Tue Aug 10 21:13:12 2010 -0700

    [Hyena.Gui] Fix crash-causing race in ListViewAccessible
    
    Proper fix for bgo#622158, ensuring the model/selection changed handlers
    are run on the GUI thread.  Should also fix bgo#626335

 .../Accessibility/ListViewAccessible.cs            |   19 +++++++++++++++----
 1 files changed, 15 insertions(+), 4 deletions(-)
---
diff --git a/Hyena.Gui/Hyena.Data.Gui/Accessibility/ListViewAccessible.cs b/Hyena.Gui/Hyena.Data.Gui/Accessibility/ListViewAccessible.cs
index a9ba835..eac7041 100644
--- a/Hyena.Gui/Hyena.Data.Gui/Accessibility/ListViewAccessible.cs
+++ b/Hyena.Gui/Hyena.Data.Gui/Accessibility/ListViewAccessible.cs
@@ -53,9 +53,9 @@ namespace Hyena.Data.Gui.Accessibility
 
             cell_cache = new Dictionary<int, ColumnCellAccessible> ();
 
-            list_view.ModelChanged += (o, a) => OnModelChanged ();
-            list_view.ModelReloaded += (o, a) => OnModelChanged ();
-            OnModelChanged ();
+            list_view.ModelChanged += OnModelChanged;
+            list_view.ModelReloaded += OnModelChanged;
+            OnModelChanged (null, null);
 
             list_view.SelectionProxy.FocusChanged += OnSelectionFocusChanged;
             list_view.ActiveColumnChanged += OnSelectionFocusChanged;
@@ -126,7 +126,13 @@ namespace Hyena.Data.Gui.Accessibility
             return RefAt (row, col);
         }
 
-        private void OnModelChanged ()
+
+        private void OnModelChanged (object o, EventArgs a)
+        {
+            ThreadAssist.ProxyToMain (EmitModelChanged);
+        }
+
+        private void EmitModelChanged ()
         {
             GLib.Signal.Emit (this, "model_changed");
             cell_cache.Clear ();
@@ -138,6 +144,11 @@ namespace Hyena.Data.Gui.Accessibility
 
         private void OnSelectionFocusChanged (object o, EventArgs a)
         {
+            ThreadAssist.ProxyToMain (EmitDescendantChanged);
+        }
+
+        private void EmitDescendantChanged ()
+        {
             var cell = ActiveCell;
             if (cell != null) {
                 GLib.Signal.Emit (this, "active-descendant-changed", cell.Handle);