The watched live session for the six deferred lifecycle items, each verified
against real yt-dlp/Electron behavior on Windows:
- R4: cancel now deletes the download's orphaned partials. The engine captures
the final output path via a new `--print before_dl:dest|%(filename)s`
(empirically %(filepath)s is still 'NA' that early) and the close handler
sweeps only unambiguous intermediates (.part / .part-Frag* / .ytdl /
<stem>.fNNN.<ext>) via the pure, unit-tested lib/partials.ts — never a bare
<stem>.<ext> or another download's files. Live-verified with decoys.
- L65: verified-acceptable, no code change — a taskkill /F pause leaves the
.part byte-intact and yt-dlp --continue resumes at the exact byte offset.
- L139: spawn↔self-update interlock (new ytdlpLock.ts). The updater refuses
while any yt-dlp spawn is live; download/terminal IPC handlers hold (await)
behind an in-progress exe rewrite instead of failing.
- B2: source indexing is cancellable — AbortSignal through the probe walk
(kills the in-flight child, live-verified via tasklist), sources:index-cancel
IPC, and a Cancel button in the Library add-source row.
- B6: app-update download is cancellable — app:update-cancel routes through
the existing finish() teardown (abort + destroy + unlink, live-verified on
Electron net.request); Cancel button under the update progress bar. The
checksum phase is cancelable too.
- L143: closing the window mid-download (non-tray mode) now offers a native
tray-independent "Quit anyway / Keep downloading" dialog, replacing the
passive "use the tray to quit" notification.
Peer-review pass caught and fixed: a non-reentrant update lock (concurrent
begin clobbered the settle promise), a dead Cancel window during the B6
checksum fetch + a canceller slot-ownership bug (L140 shape), and a
persist-after-cancel hole in the index walk.
typecheck + 304 tests + eslint + production build green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
