Key legal question
Whether the appeal remained admissible after the applicant acquired Swiss citizenship through adoption during the proceedings.
Extracted holding
The appellant's current and practical interest ceased because he became a Swiss citizen, so the appeal had become moot and had to be struck from the docket.
Extracted reasoning
A current practical interest is required until the Federal Supreme Court decides. The post-judgment adoption directly removed the need for a residence permit and eliminated the subject matter of the dispute; no exceptional point of principle justified deciding the case anyway.