Show in Media sources

[Lukas]

One more point against show in source:

If user has disabled auto-scanning (like me, as part of collections
gets regularly unmounted). The track wont disappear form collection if
it is deleted. And even if auto-scanning is on, track wont be removed
instantly form both playlist and collection.

By the way, I haven't read any arguments against having an "Actions"
node in context menu, where *all* actions, not directly related to the
playing/skipping/etc track would be moved to?