void updateView(boolean updateMakers, boolean updateNavigation) {
			for (MarkerSetImpl markers : markerSets) {
				markers.updateView(updateMakers, updateNavigation);
			}
		}
Use this close listener approach instead of plugin events, since we don't get a
ProgramClosedPluginEvent when a trace view is closed, but we can listen for its
domain object closing, which works for plain programs, too.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/marker/MarkerManager.java