public void programDeactivated(Program deactivatedProgram) {
		deactivatedProgram.removeListener(this);
		this.program = null;
	}
Invoked when a new location has been detected in the listing. When
this happens we need to update the tag list to show what tags are assigned
at the current location.

@param loc the address selected in the listing
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/function/tags/FunctionTagProvider.java