pg_stat_statements doesn't track commit from pl/pgsql blocks

Hello,

It seems that pgss doesn't track commit (nor rollback) commands from
pl/pgsql blocks.
using psql in version 11.1:

select pg_stat_statements_reset();
do $$ begin commit; end $$;
select calls,query from pg_stat_statements;

...

I don't know how difficult it would be to fix it,
but this could help in trouble shouting.

Regards
PAscal

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