v$sqltext_with_newlines contains the same data as v$sqltext, except that newlines are not replaced with spaces.
select /* tq84: v$sqltext_with_newlines */
listagg(t.sql_text, '') within group (order by t.piece)
from
v$sqlarea a join
v$sqltext_with_newlines t on a.sql_id = t.sql_id
where
a.sql_text like '%tq84: v$sqltext_with_newlines %'
order by
t.piece;