Started work on Item Filter Preview module

Filtration.ObjectModel/Enums/FilterPredicateOperator.cs

@@ -6,8 +6,6 @@ namespace Filtration.ObjectModel.Enums
     {
         [Description("=")]
         Equal,
-        [Description("!=")]
-        NotEqual,
         [Description("<")]
         LessThan,
         [Description("<=")]

Filtration.ObjectModel/ItemFilterBlock.cs

@@ -88,12 +88,7 @@ namespace Filtration.ObjectModel
                 return false;
             }
 
-            if (startingBlockGroup.ParentGroup != null)
-            {
-                return HasBlockGroupInParentHierarchy(targetBlockGroup, startingBlockGroup.ParentGroup);
-            }
-
-            return false;
+            return startingBlockGroup.ParentGroup != null && HasBlockGroupInParentHierarchy(targetBlockGroup, startingBlockGroup.ParentGroup);
         }
         
         private void OnBlockGroupStatusChanged(object sender, EventArgs e)

Filtration.ObjectModel/ItemFilterScript.cs

@@ -7,7 +7,19 @@ using Filtration.ObjectModel.ThemeEditor;
 
 namespace Filtration.ObjectModel
 {
-    public class ItemFilterScript
+    public interface IItemFilterScript
+    {
+        ObservableCollection<ItemFilterBlock> ItemFilterBlocks { get; }
+        ObservableCollection<ItemFilterBlockGroup> ItemFilterBlockGroups { get; }
+        ThemeComponentCollection ThemeComponents { get; set; }
+        string FilePath { get; set; }
+        string Description { get; set; }
+        DateTime DateModified { get; set; }
+        List<string> Validate();
+        void ReplaceColors(ReplaceColorsParameterSet replaceColorsParameterSet);
+    }
+
+    public class ItemFilterScript : IItemFilterScript
     {
         public ItemFilterScript()
         {