Speedier unmapped folders lookup.

NzbDrone.Common/NzbDrone.Common.csproj

@@ -91,6 +91,7 @@
     <Compile Include="Exceptions\NzbDroneException.cs" />
     <Compile Include="Instrumentation\GlobalExceptionHandlers.cs" />
     <Compile Include="Instrumentation\ExceptronTarget.cs" />
+    <Compile Include="PathEqualityComparer.cs" />
     <Compile Include="TPL\LimitedConcurrencyLevelTaskScheduler.cs" />
     <Compile Include="Security\IgnoreCertErrorPolicy.cs" />
     <Compile Include="StringExtensions.cs" />

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();
+        }
+    }
+}

NzbDrone.Common/PathExtensions.cs

@@ -35,11 +35,12 @@ namespace NzbDrone.Common
             return info.FullName.TrimEnd('/').Trim('\\', ' ');
         }
 
-
         public static bool PathEquals(this string firstPath, string secondPath)
         {
-            Ensure.That(() => firstPath).IsValidPath();
-            Ensure.That(() => secondPath).IsValidPath();
+            if (OsInfo.IsLinux)
+            {
+                return String.Equals(firstPath.CleanFilePath(), secondPath.CleanFilePath());
+            }
 
             return String.Equals(firstPath.CleanFilePath(), secondPath.CleanFilePath(), StringComparison.InvariantCultureIgnoreCase);
         }