Mattias Thall c223e57463 fix: prevent concurrent yt-dlp sessions that invalidate cookies ...

Three code paths could fire yt-dlp immediately (polite=False) while a
download was already running, causing YouTube to see two simultaneous
authenticated sessions and invalidate the cookie:

- search.py: live yt-dlp fallback now skipped while any download is active
- downloads.py: _ensure_video uses polite=True so it waits for active
  downloads to finish before fetching metadata for an unknown video
- channels.py: follow_by_url uses polite=True when fetching metadata
  for a brand-new channel

Added is_download_active() helper to ytdlp.py to expose the active
download state without importing private globals.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-27 03:07:19 +02:00

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