Split IDDB filtering into a helper method

SabreTools.DatFiles/ItemDictionaryDB.cs

@@ -858,13 +858,24 @@ namespace SabreTools.DatFiles
             foreach (var key in keys)
 #endif
             {
-                (long, DatItem)[]? items = GetDatItemsForBucket(key);
-                if (items == null)
+                ExecuteFilterOnBucket(filterRunner, key);
 #if NET40_OR_GREATER || NETCOREAPP
-                    return;
+            });
 #else
-                    continue;
+            }
 #endif
+        }
+
+        /// <summary>
+        /// Execute all filters in a filter runner on a single bucket
+        /// </summary>
+        /// <param name="filterRunner">Preconfigured filter runner to use</param>
+        /// <param name="bucketName">Name of the bucket to filter on</param>
+        private void ExecuteFilterOnBucket(FilterRunner filterRunner, string bucketName)
+        {
+            (long, DatItem)[]? items = GetDatItemsForBucket(bucketName);
+            if (items == null)
+                return;
 
             // Filter all items in the current key
             var newItems = new ConcurrentList<(long, DatItem)>();
@@ -875,13 +886,7 @@ namespace SabreTools.DatFiles
             }
 
             // Set the value in the key to the new set
-                _buckets[key] = newItems.Select(i => i.Item1).ToConcurrentList();
-
-#if NET40_OR_GREATER || NETCOREAPP
-            });
-#else
-            }
-#endif
+            _buckets[bucketName] = newItems.Select(i => i.Item1).ToConcurrentList();
         }
 
         #endregion