The term "guardianship proceeding" means a matter or proceeding related to a guardianship or any other matter covered by this title, including:
(1) the appointment of a guardian of a minor or other incapacitated person, including an incapacitated adult for whom another court obtained continuing, exclusive jurisdiction in a suit affecting the parent-child relationship when the person was a child;
(2) an application, petition, or motion regarding guardianship or a substitute for guardianship under this title;
(3) a mental health action; and
(4) an application, petition, or motion regarding a trust created under Chapter 1301.