[Mac] Improve search/arrange

This does a number of things:

 - We now auto-expand categories when searching
 - We now remember & restore open categories from searching and switching arrange
modes.
 - Order & Grouping are now cached rather than running every cell.
 - Order & Grouping are now a view on the existing list of properties, using the
same view models.

1 files changed, 19 insertions, 0 deletions

diff --git a/Xamarin.PropertyEditing.Mac/NSObjectFacade.cs b/Xamarin.PropertyEditing.Mac/NSObjectFacade.cs
new file mode 100644
index 0000000..605c963
--- /dev/null
+++ b/Xamarin.PropertyEditing.Mac/NSObjectFacade.cs
@@ -0,0 +1,19 @@
+using System;
+using Foundation;
+
+namespace Xamarin.PropertyEditing.Mac
+{
+	internal class NSObjectFacade
+		: NSObject
+	{
+		public NSObjectFacade (object obj)
+		{
+			Target = obj;
+		}
+
+		public object Target
+		{
+			get;
+		}
+	}
+}