Key legal question
Whether refusing to postpone the appeal hearing to hear witness F________ violated the right to be heard.
Extracted holding
No violation: the cantonal court could refuse the adjournment because the testimony was not indispensable and could be rejected after anticipatory assessment of evidence.
Extracted reasoning
Geneva procedure allowed new witnesses on appeal, but the court could deny a hearing when the evidence was unnecessary. F________ had already been heard in the investigation in the presence of the appellant and counsel, and nothing indicated he could add anything relevant.