Only emit 'done' when the store behind immediate store finished to write the chunks

[Chocobozzz]

With the FS chunk store, the torrent might emit done while the store did not finished to write the chunks in the file. So if we then manipulate the file we may have inconsistencies errors.

We could add a callback here: https://github.com/webtorrent/webtorrent/blob/master/lib/torrent.js#L1492, store them in an array (one per file) and only emit the done event when all the callback are called: https://github.com/webtorrent/webtorrent/blob/master/lib/torrent.js#L1526

[whitesunset]

Any update with this issue?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[feross]

This sounds like a bug. PR welcome to fix this.