(QCinherit):

(QCinherit):
  New variable.
(syms_of_xfaces):
  Initialize it.
(LFACE_INHERIT):
  New macro.
(Finternal_get_lisp_face_attribute, merge_face_vector_with_property)
(Finternal_set_lisp_face_attribute):
  Deal with :inherit attribute.
(check_lface_attrs):
  Allow new types of face height.  Check inherit attribute.
(CYCLE_CHECK):
  New macro.
(merge_face_inheritance):
  New function.
(merge_face_vectors):
  Merge inherited faces too.  Add F and CYCLE_CHECK arguments.
(merge_face_vector_with_property, Finternal_merge_in_global_face)
(lookup_named_face, lookup_derived_face, realize_named_face)
(face_at_string_position, face_at_buffer_position):
  Supply new F and CYCLE_CHECK arguments to merge_face_vectors.
(merge_face_heights):
  New function.
(merge_face_vectors, merge_face_vector_with_property)
(Finternal_set_lisp_face_attribute):
  Call merge_face_heights to handle relative face heights.
(lface_same_font_attributes_p):
  Compare heights using EQ.