Update

Assets/Scripts/Player/CharacterController/Editor/vGenericInputSelector.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEditor;
+using System;
+
+public class vGenericInputSelector : PopupWindowContent
+{
+    public vGenericInputSelector (string label,string lastInput, bool drawKeys,bool isUnityInput, UnityEngine.Events.UnityAction<string, bool> onSelectInput)
+    {
+        this.label = label;
+        this.drawKeys = drawKeys;
+        this.onSelectInput = onSelectInput;
+        this.isUnityInput = isUnityInput;
+        this.lastInput = lastInput;
+        if(drawKeys)
+        {
+            toolBar = new GUIContent[] { new GUIContent("Unity Inputs", unityInputToolip), new GUIContent("KeyCodes", keyCodeTooltip) };
+            selectedToolBar = isUnityInput?0:1;
+        }          
+        else toolBar = new GUIContent[] { new GUIContent("Unity Inputs", unityInputToolip)};
+       
+
+    }
+    const string keyCodeTooltip = "KeyCode use a  Enum (GetKey, GetKeyDown,GetKeyUp)";
+    const string unityInputToolip = "Unity input use input names created in InputManager (GetButton, GetButtonDown, GetButtonUp";
+    public static UnityEngine.Object inputManager;
+    public  static string[] _unityInputs = new string[0];
+    public static string[] _unityKeys = new string[0];
+    public static float minHeight = EditorGUIUtility.singleLineHeight*10;
+    public static float maxHeight = EditorGUIUtility.singleLineHeight * 50;
+    public static float height= EditorGUIUtility.singleLineHeight;
+    public string label;
+    public string search;  
+   
+    protected Vector2 scrollView;
+    protected Vector2 scrollView2;
+    protected int selectedToolBar = 0;
+    protected bool drawKeys =true;
+    protected bool isUnityInput;
+    protected string lastInput;
+    protected GUIContent[] toolBar;  
+    /// <summary>
+    /// Event to return the select input and if the input is an  keycode
+    /// </summary>
+    public UnityEngine.Events.UnityAction<string, bool> onSelectInput;
+
+    public override Vector2 GetWindowSize()
+    {
+        return new Vector2(300, Mathf.Clamp((height * UnityInputs.Length),minHeight,maxHeight));
+    }
+
+    public override void OnGUI(Rect rect)
+    {
+        GUILayout.BeginArea(rect,"","box");
+        GUILayout.Box(label,GUILayout.ExpandWidth(true));
+        DrawFilter();
+
+        selectedToolBar = GUILayout.Toolbar(selectedToolBar, toolBar);
+        if(selectedToolBar==0) DrawInput( UnityInputs, false, ref scrollView,isUnityInput );
+        else if (selectedToolBar ==1) DrawInput( UnityKeys, true, ref scrollView2,!isUnityInput);
+        GUILayout.EndArea();
+     //   if(GUI.GetNameOfFocusedControl()!= "Search Field") EditorGUI.FocusTextInControl("Search Field");
+
+    }
+    void DrawInput( string[] inputs,bool isKey,ref  Vector2 scrollView,bool hightlightName = false)
+    {
+        GUILayout.BeginVertical();       
+        GUILayout.Space(10);
+        scrollView = GUILayout.BeginScrollView(scrollView);
+            for (int i=0;i< inputs.Length;i++)
+            {            
+                var input = inputs[i];
+            if (string.IsNullOrEmpty(search) || input.Trim().StartsWith(search) || input.Trim().ToLower().StartsWith(search.ToLower()))
+            {
+                if (hightlightName && input.Equals(lastInput)) GUI.color = Color.green;
+                if (GUILayout.Button(input, EditorStyles.toolbarButton))
+                {
+                    onSelectInput?.Invoke(input, isKey);
+                    editorWindow.Close();
+                }
+            }
+                GUI.color = Color.white;
+            }
+        GUILayout.EndScrollView();
+        GUILayout.EndVertical();
+    }
+
+    void DrawFilter()
+    {
+       
+        GUILayout.BeginHorizontal();
+
+        GUI.SetNextControlName("Search Field");
+        search = GUILayout.TextField(search, EditorStyles.toolbarSearchField);
+        if(string.IsNullOrEmpty(search))
+        {
+            var fieldRect = GUILayoutUtility.GetLastRect();
+            GUI.Label(fieldRect, "  ....Search for input",EditorStyles.centeredGreyMiniLabel);
+        }
+          
+        
+        GUILayout.EndHorizontal();
+    }
+
+    static string[] UnityKeys
+    {
+        get
+        {
+            if (_unityKeys != null && _unityKeys.Length > 0) return _unityKeys;
+            _unityKeys = Enum.GetNames(typeof(KeyCode));
+            return _unityKeys;
+        }
+    }
+
+    static string[] UnityInputs
+    {
+        get
+        {
+            if (_unityInputs != null && _unityInputs.Length > 0) return _unityInputs;
+
+            if (!inputManager)
+                inputManager = AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/InputManager.asset")[0];
+
+            SerializedObject obj = new SerializedObject(inputManager);
+            SerializedProperty axisArray = obj.FindProperty("m_Axes");
+
+            if (_unityInputs.Length != axisArray.arraySize)
+                _unityInputs = new string[axisArray.arraySize];
+            for (int i = 0; i < axisArray.arraySize; ++i)
+            {
+                var axis = axisArray.GetArrayElementAtIndex(i);
+                var name = axis.FindPropertyRelative("m_Name").stringValue;
+                _unityInputs[i] = name;
+            }
+
+            return _unityInputs;
+        }
+    }
+}