How to reproduce:
1. From any project, add the attached ForcesRepaint MonoBehaviour (see attached files)
2. Create a new GameObject and add the ForcesRepaint MonoBehaviour on it.
3. Open multiple inspector windows (and/or Properties... windows) and lock them to different objects.
4. Open another inspector window and select the GameObject containing the ForcesRepaint MonoBehaviour.

Expected result: The inspector windows do not repaint constantly.
Actual result: If the ForcesRepaint MonoBehaviour is inspected, all inspector windows are repainted every frame (see attached files).