sort attribute drop-down list when editing Match rules

When adding new attributes to Match rules or editing existing Match rule attributes, the "Attribute" and "Crosscheck Attribute" drop-down lists show the attributes in an unordered/unsorted list.

It would be helpful if the drop-down list of attributes was sorted in alphabetical order.

Configure > Rules > <select rule> > Rule Attributes > Add New Rule Attribute 

Configure > Rules > <select rule> > Rule Attributes > <select attribute>