Indicates this object is visible, e.
g. has been explicitly marked for exposure to the user. ATSPI_STATE_VISIBLE is no guarantee that the object is actually
unobscured on the screen, only that it is 'potentially' visible, barring obstruction, being scrolled or clipped out of the field of view,
or having an ancestor container that has not yet made visible. A widget is potentially onscreen if it has both ATSPI_STATE_VISIBLE
and ATSPI_STATE_SHOWING. The absence of ATSPI_STATE_VISIBLE and ATSPI_STATE_SHOWING is
semantically equivalent to saying that an object is 'hidden'.