* RollingSession: add fn contains Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * handle_import_statements fix ancient dispute check Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * work with earliest session instead of latest Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * update comment Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>