Add Visject per-node custom search and use it for Multi Blend nodes to filter animations used

Source/Editor/Surface/Archetypes/Animation.MultiBlend.cs

@@ -937,6 +937,22 @@ namespace FlaxEditor.Surface.Archetypes
 
                 UpdateUI();
             }
+
+            /// <inheritdoc />
+            public override bool Search(string text)
+            {
+                FlaxEngine.Json.JsonSerializer.ParseID(text, out var id);
+                if (id != Guid.Empty)
+                {
+                    for (int i = 5; i < Values.Length; i += 2)
+                    {
+                        if ((Guid)Values[i] == id)
+                            return true;
+                    }
+                }
+
+                return base.Search(text);
+            }
         }
 
         /// <summary>

Source/Editor/Surface/SurfaceNode.cs

@@ -862,6 +862,16 @@ namespace FlaxEditor.Surface
             }
         }
 
+        /// <summary>
+        /// Custom function to check if node matches a given search query.
+        /// </summary>
+        /// <param name="text">Text to check.</param>
+        /// <returns>True if node contains a given value.</returns>
+        public virtual bool Search(string text)
+        {
+            return false;
+        }
+
         private string GetTooltip()
         {
             StringBuilder sb = new StringBuilder();

Source/Editor/Windows/Search/ContentSearchWindow.cs

@@ -617,7 +617,7 @@ namespace FlaxEngine.Windows.Search
                 }
                 var nodeSearchText = node.ContentSearchText;
 
-                if (newTreeNodes.Count != 0 || (nodeSearchText != null && IsSearchMatch(ref nodeSearchText)))
+                if (newTreeNodes.Count != 0 || (nodeSearchText != null && IsSearchMatch(ref nodeSearchText)) || node.Search(_searchText))
                 {
                     AddAssetSearchResult(ref assetTreeNode, asset);
                     var nodeTreeNode = new SearchResultTreeNode