Bug: Removing everything but XYZ from the playlist

[cassava]

The query

+r<ae:".*" !b: End of Silence>

should not include End of Silence, but it does.
So the list effectively gets cleared.

If we could implement a way to have several lists in memory at a time:

• playlist
• media-library

then we could search in both of these... it might be more efficient for more complex queries. If we could then use real SETS based on filenames or something, that would be even better.

It would make the implementation much cleaner.