boolean canMoveParameterUp() {
		if (selectedParams.size() != 1) {
			return false;
		}
		ParamInfo p = selectedParams.iterator().next();
		if (p.getOrdinal() <= getAutoParamCount()) {
			return false;
		}
		return true;
	}
Get the effective function to which changes will be made.  This
will be the same as function unless it is a thunk in which case
the returned function will be the ultimate non-thunk function.
@return non-thunk function
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/function/editor/FunctionEditorModel.java