Try to improve the "New Music" menu when used with online music servi…

…ces.

As we don't have a good "first seen" for online music, let's use the timestamp when an album was added to the user's collection on a given music service as the addition time. This should put online albums in the right place inside the New Music menu.

Slim/Schema.pm

@@ -1528,9 +1528,11 @@ sub _createTrack {
 			$columnValueHash->{urlmd5},
 		);
 
+		my $externalTrack = $columnValueHash->{extid} && $columnValueHash->{url} eq $columnValueHash->{extid};
+
 		# retrievePersistent will always return undef or a track metadata object
 		if ( !$trackPersistentHash ) {
-			$persistentColumnValueHash->{added}  = time();
+			$persistentColumnValueHash->{added}  = ($externalTrack && $columnValueHash->{timestamp}) || time();
 			$persistentColumnValueHash->{url}    = $columnValueHash->{url};
 			$persistentColumnValueHash->{urlmd5} = $columnValueHash->{urlmd5};
 
@@ -1552,6 +1554,10 @@ sub _createTrack {
 			$trackPersistentHash->{url}    = $columnValueHash->{url};
 			$trackPersistentHash->{urlmd5} = $columnValueHash->{urlmd5};
 
+			if ($externalTrack && $columnValueHash->{timestamp}) {
+				$trackPersistentHash->{added} = $columnValueHash->{timestamp}
+			}
+
 			$self->_updateHash( tracks_persistent => $trackPersistentHash, 'id' );
 		}
 	}