Drop internal directory references when we add an exclude path.

Index: beagled/FileSystemQueryable/FileNameFilter.cs
===================================================================
RCS file: /cvs/gnome/beagle/beagled/FileSystemQueryable/FileNameFilter.cs,v
retrieving revision 1.21
diff -u -B -p -r1.21 FileNameFilter.cs
--- beagled/FileSystemQueryable/FileNameFilter.cs	10 Aug 2005 22:27:04 -0000	1.21
+++ beagled/FileSystemQueryable/FileNameFilter.cs	12 Aug 2005 14:11:07 -0000
@@ -118,6 +118,7 @@ namespace Beagle.Daemon.FileSystemQuerya
 			switch (exclude.Type) {
 			case ExcludeType.Path:
 				exclude_paths.Add (exclude);
+				queryable.RemoveDirectory (exclude.Value);
 				break;
 			case ExcludeType.Pattern:
 				exclude_patterns.Add (exclude);
Index: beagled/FileSystemQueryable/FileSystemQueryable.cs
===================================================================
RCS file: /cvs/gnome/beagle/beagled/FileSystemQueryable/FileSystemQueryable.cs,v
retrieving revision 1.68
diff -u -B -p -r1.68 FileSystemQueryable.cs
--- beagled/FileSystemQueryable/FileSystemQueryable.cs	11 Aug 2005 22:33:47 -0000	1.68
+++ beagled/FileSystemQueryable/FileSystemQueryable.cs	12 Aug 2005 14:11:09 -0000
@@ -568,6 +568,13 @@ namespace Beagle.Daemon.FileSystemQuerya
 			ThisScheduler.Add (task);
 		}
 
+		public void RemoveDirectory (string path)
+		{
+			DirectoryModel dir = GetDirectoryModelByPath (path);
+				if (dir != null)
+					RemoveDirectory (dir);
+		}
+
 		private void MoveDirectory (DirectoryModel dir, 
 					    DirectoryModel new_parent, // or null if we are just renaming
 					    string new_name)