Case T-530/15: Judgment of the General Court of 11 July 2019 — Huhtamäki and Huhtamäki Flexible Packaging Germany v Commission (Competition — Cartels — Retail food packaging market — Decision finding an infringement of Article 101 TFEU and of Article 53 of the EEA Agreement — Evidence of involvement in the cartel — Single and continuous infringement — Attributability of unlawful conduct — 2006 Guidelines for calculating the amount of fines — Proportionality — Equal treatment)