Case C-12/19 P: Judgment of the Court (Fourth Chamber) of 17 September 2020 — Mylène Troszczynski v European Parliament (Appeal — Law governing the institutions — Member of the European Parliament — Protocol on the privileges and immunities of the European Union — Article 8 — Parliamentary immunity — Activity not connected to parliamentary duties — Publication on the Member’s Twitter account — Article 9 — Parliamentary privilege — Scope — Decision to waive parliamentary immunity)