+ if (playlists->source_use_count (fs) != 0) {
+ all_sources.insert (fs->path());
+ } else {
+
+ /* we might not remove this source from disk, because it may be used
+ by other snapshots, but its not being used in this version
+ so lets get rid of it now, along with any representative regions
+ in the region list.
+ */
+
+ RegionFactory::remove_regions_using_source (i->second);
+ sources.erase (i);
+ }
+ }