Speedier unmapped folders lookup.

NzbDrone.Common/PathEqualityComparer.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace NzbDrone.Common
+{
+    public class PathEqualityComparer : IEqualityComparer<String>
+    {
+        public bool Equals(string x, string y)
+        {
+            return x.PathEquals(y);
+        }
+
+        public int GetHashCode(string obj)
+        {
+            return obj.CleanFilePath().GetHashCode();
+        }
+    }
+}