O_VISIBLE
O_VISIBLE |\
#define O_SELECTABLE (O_ACTIVE | O_VISIBLE)
if (Field_Has_Option(field, O_VISIBLE))
if ((unsigned)changed_opts & O_VISIBLE)
if ((unsigned)newopts & O_VISIBLE)
((unsigned)newopts & O_VISIBLE))
(Field_Has_Option(field, O_VISIBLE)) &&
(Field_Has_Option(field, O_VISIBLE)) &&\
if (Field_Has_Option(*field, O_VISIBLE))
!((unsigned)proposed->opts & O_VISIBLE))
if ((unsigned)field_on_page->opts & O_VISIBLE)