For some reason, dconf editor is no longer able to customise thumnailers as explained here.
I want to exclude pdfs and plain text thumbnails. I add ['application/pdf','text/plain']
to org > gnome > desktop > thumbnailer > disable
, and (after deleting everything within ~/.thumbnails/ and rebooting) pdf and plain text thumbnails are still being displayed.
Any ideas as to what might be the problem?