Mouse hover highlight for project window working with old Input System

#if UNITY_EDITOR

using System;
using UnityEditor;
using UnityEngine;

#if ENABLE_INPUT_SYSTEM
using UnityEngine.InputSystem;
#endif

namespace Utility.EditorUtilities
{
    public static class ProjectWindowHoverUtility
    {
        private static Type ProjectWindowType = null;
        private static Vector2 CachedMousePosition = default;
        private static double LastUpdateTime = -3d;

        private static Color RectOutlineColour = new Color(1, 1, 1, 0.06f);

        private const string Project_Window_Type_String = "ProjectBrowser";
        private const double Update_Frequency_Time = 2d;

        [InitializeOnLoadMethod]
        private static void DisplayRectOverProjectWindowHoveredItem()
        {
            EditorApplication.update += HandleEditorUpdate;
            EditorApplication.projectWindowItemOnGUI += DrawRectOverFileInProjectWindow;
        }

        private static void HandleEditorUpdate()
        {
            if (ProjectWindowType != null)
            {
                #if ENABLE_INPUT_SYSTEM
                Mouse mouse = Mouse.current;
                if (mouse == null) return;
                Vector2 mousePosition = mouse.position.value;
                #else
                Vector2 mousePosition = Input.mousePosition;
                #endif

                if (Mathf.Approximately(mousePosition.x, CachedMousePosition.x)
                    && Mathf.Approximately(mousePosition.y, CachedMousePosition.y)) return;

                CachedMousePosition = mousePosition;

                EditorWindow mouseOverWindow = EditorWindow.mouseOverWindow;
                if (mouseOverWindow == null) return;
                if (mouseOverWindow.GetType() != ProjectWindowType) return;

                mouseOverWindow.Repaint();
            }
            else if (EditorApplication.timeSinceStartup > LastUpdateTime + Update_Frequency_Time)
            {
                LastUpdateTime = EditorApplication.timeSinceStartup;
                foreach (EditorWindow window in Resources.FindObjectsOfTypeAll<EditorWindow>())
                {
                    if (!window.GetType().Name.EndsWith(Project_Window_Type_String)) continue;

                    ProjectWindowType = window.GetType();
                    break;
                }
            }
        }

        private static void DrawRectOverFileInProjectWindow(string guid, Rect selectionRect)
        {
            selectionRect.width += selectionRect.x;
            selectionRect.x = 0;

            Vector2 mousePosition = Event.current.mousePosition;

            if (!selectionRect.Contains(mousePosition)) return;

            EditorGUI.DrawRect(selectionRect, RectOutlineColour);
        }
    }
}

#endif