Hi,
It should pick up and rebuild the index when it detects changes - but I have seen this fail occasionally due to dates not propagating thru, etc. In this case however, you could try making it Rebuild automatically. For example, just before a build is started...
using UnityEditor;
using UnityEditor.Build;
using UnityEngine;
class tk2dRebuildIndexPreprocessor : IPreprocessBuild
{
public int callbackOrder { get { return 0; } }
public void OnPreprocessBuild(BuildTarget target, string path)
{
tk2dEditorUtility.RebuildIndex();
}
}