The sync_to_device plugin shouldn't delete files named 'cover.jpg'

[Tamriel]

I am using an Automatic Cover Art Downloader which adds 'cover.jpg' files in each album folder. The sync_to_device plugin deletes them again in the target folder. It shall not.

A nicer option would be to sync the cover files from the library to the target folder, too. But that's more complex to implement.