FIX: Modifying or changing focus on composite bindings in the Input Actions Editor no longer cause a full UI rebuild

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -34,6 +34,7 @@ however, it has to be formatted properly to pass verification tests.
 - Fixed an issue with default device selection when adding new Control Scheme.
 - Fixed an issue where action map delegates were not updated when the asset already assigned to the PlayerInput component were changed [ISXB-711](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-711).
 - Fixed Action properties edition in the UI Toolkit version of the Input Actions Asset editor. [ISXB-1277](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1277)
+- Fixed an issue in input actions editor window that caused certain fields in custom input composite bindings to require multiple clicks to action / focus. [ISXB-1171](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1171)
 
 ### Changed
 - Added back the InputManager to InputSystem project-wide asset migration code with performance improvement (ISX-2086).

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/InputActionsEditorSettingsProvider.cs

@@ -176,7 +176,7 @@ private void OnFocusOut(FocusOutEvent @event = null)
             DelayFocusLost(element == null);
         }
 
-        private void OnStateChanged(InputActionsEditorState newState)
+        private void OnStateChanged(InputActionsEditorState newState, UIRebuildMode editorRebuildMode)
         {
 #if UNITY_INPUT_SYSTEM_INPUT_ACTIONS_EDITOR_AUTO_SAVE_ON_FOCUS_LOST
             // No action, auto-saved on edit-focus lost

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/InputActionsEditorWindow.cs

@@ -237,7 +237,7 @@ private void BuildUI()
             m_StateContainer.Initialize(rootVisualElement.Q("action-editor"));
         }
 
-        private void OnStateChanged(InputActionsEditorState newState)
+        private void OnStateChanged(InputActionsEditorState newState, UIRebuildMode editorRebuildMode)
         {
             DirtyInputActionsEditorWindow(newState);
             m_State = newState;

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/StateContainer.cs

@@ -7,9 +7,16 @@
 
 namespace UnityEngine.InputSystem.Editor
 {
+    // Enum used to dictate if a state change should rebuild the Input Actions editor UI
+    internal enum UIRebuildMode
+    {
+        None,
+        Rebuild,
+    }
+
     internal class StateContainer
     {
-        public event Action<InputActionsEditorState> StateChanged;
+        public event Action<InputActionsEditorState, UIRebuildMode> StateChanged;
 
         private VisualElement m_RootVisualElement;
         private InputActionsEditorState m_State;
@@ -21,7 +28,7 @@ public StateContainer(InputActionsEditorState initialState, string assetGUID)
             this.assetGUID = assetGUID;
         }
 
-        public void Dispatch(Command command)
+        public void Dispatch(Command command, UIRebuildMode editorRebuildMode = UIRebuildMode.Rebuild)
         {
             if (command == null)
                 throw new ArgumentNullException(nameof(command));
@@ -36,7 +43,7 @@ public void Dispatch(Command command)
                 // catch exceptions here or the UIToolkit scheduled event will keep firing forever.
                 try
                 {
-                    StateChanged?.Invoke(m_State);
+                    StateChanged?.Invoke(m_State, editorRebuildMode);
                 }
                 catch (Exception e)
                 {
@@ -55,9 +62,9 @@ public void Initialize(VisualElement rootVisualElement)
             m_RootVisualElement.Unbind();
             m_RootVisualElement.TrackSerializedObjectValue(m_State.serializedObject, so =>
             {
-                StateChanged?.Invoke(m_State);
+                StateChanged?.Invoke(m_State, UIRebuildMode.Rebuild);
             });
-            StateChanged?.Invoke(m_State);
+            StateChanged?.Invoke(m_State, UIRebuildMode.Rebuild);
             rootVisualElement.Bind(m_State.serializedObject);
         }
 

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/Views/CompositeBindingPropertiesView.cs

@@ -42,7 +42,7 @@ public override void RedrawUI(ViewState viewState)
 
             viewState.parameterListView.onChange = () =>
             {
-                Dispatch(Commands.UpdatePathNameAndValues(viewState.parameterListView.GetParameters(), viewState.selectedBindingPath));
+                Dispatch(Commands.UpdatePathNameAndValues(viewState.parameterListView.GetParameters(), viewState.selectedBindingPath), UIRebuildMode.None);
             };
             viewState.parameterListView.OnDrawVisualElements(rootElement);
         }

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/Views/ViewBase.cs

@@ -26,8 +26,12 @@ protected ViewBase(VisualElement root, StateContainer stateContainer)
             m_ChildViews = new List<IView>();
         }
 
-        protected void OnStateChanged(InputActionsEditorState state)
+        protected void OnStateChanged(InputActionsEditorState state, UIRebuildMode editorRebuildMode)
         {
+            // Return early if rebuilding the editor UI isn't required (ISXB-1171)
+            if (editorRebuildMode == UIRebuildMode.None)
+                return;
+
             UpdateView(state);
         }
 
@@ -70,9 +74,9 @@ public void DestroyChildView<TView>(TView view) where TView : IView
             view.DestroyView();
         }
 
-        public void Dispatch(Command command)
+        public void Dispatch(Command command, UIRebuildMode editorRebuildMode = UIRebuildMode.Rebuild)
         {
-            stateContainer.Dispatch(command);
+            stateContainer.Dispatch(command, editorRebuildMode);
         }
 
         public abstract void RedrawUI(TViewState viewState);