When you try to highlight a component that is not attached to the selected gameobject,or when you try to run highlighter without selecting any gameobject, it gets stuck in an infinite loop and never works again. (This can happen accidently)

Steps:
1. Create a new project.
2. Add attached script to the project. (HighlighterTester-1)
3. Go to Windows and Select "Highlighter Tester".
4. Click "Highlightby Prefixlabel" and then Click "Highlight by Content".

Note: Find "Highlighter recursion detected" warning in the console.

Now highlighter will not work until we re-open unity.

WorkAround:
Re-open Unity to use Highlighter.

Reproduced on: 2017.1.1f1, 2017.1.2p3, 2017.2.0f3, 2017.3.0f1

Notes:
- Appears on both Mac and Windows.
- Appears always.