While selecting and saving a large number of files the memory use increases constantly without being freed.

The cause is the metadata view getting refreshed a lot during saving, and the temporary file list being created for the cover art display does not get freed. This also impacts performance due to all left-over file lists reacting to cover art changed signals.

See https://community.metabrainz.org/t/memory-usage-is-huge-musicbrainz-picard-3-0-0rc3/815673/