Store ActionsTreeView current focus for restoring after RedrawUI

Author: tspiller

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -17,6 +17,7 @@ however, it has to be formatted properly to pass verification tests.
 - Fixed pointerId staying the same when simultaneously releasing and then pressing in the same frame on mobile using touch. [ISXB-1006](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-845)
 - Fixed ISubmitHandler.OnSubmit event processing when operating in Manual Update mode (ISXB-1141)
 - Fixed Rename mode is not entered and name is autocompleted to default when creating a new Action Map on 2022.3. [ISXB-1151](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1151)
+- Fixed arrow key navigation of Input Actions after Action rename [ISXB-1024](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1024)
 
 ### Changed
 - Added back the InputManager to InputSystem project-wide asset migration code with performance improvement (ISX-2086)

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

@@ -202,6 +202,9 @@ public override void DestroyView()
 
         public override void RedrawUI(ViewState viewState)
         {
+            // Store the current focus before Clear/Rebuild
+            Focusable focusedElement = m_ActionsTreeView.focusController.focusedElement;
+            
             m_ActionsTreeView.Clear();
             m_ActionsTreeView.SetRootItems(viewState.treeViewData);
             m_ActionsTreeView.Rebuild();
@@ -215,6 +218,12 @@ public override void RedrawUI(ViewState viewState)
 
             // Don't want to show action properties if there's no actions.
             m_PropertiesScrollview.visible = m_ActionsTreeView.GetTreeCount() > 0;
+            
+            // Rebuild causes the ActionsTreeView to lose focus; restore if there was focus before
+            if (focusedElement != null)
+            { 
+                focusedElement.Focus();
+            }
         }
 
         private void OnDraggedItem(DragPerformEvent evt)