AtkAttributeSet which consists of the attributes explicitly
set at the position offset in the text. start.offset and end.offset are
set to the start and end of the range around offset where the attributes are
invariant. Note that end.offset is the offset of the first character
after the range. See the enum AtkTextAttribute for types of text
attributes that can be returned. Note that other attributes may also be
returned.atkTextGetRunAttributes(object, offset)offsetAtkAttributeSet] an AtkAttributeSet which contains the attributes explicitly set
at offset.start.offsetend.offset