# Open GTK page of Application Style KCM, the preview buttons should be present
# Delete `usr/lib/libexec/gtk_preview` file or rename it to something else
# Reopen GTK page of KCM - the GTK2 preview button should disappear
# Delete `usr/lib/libexec/gtk3_preview` file or rename it to something else
# Reopen GTK page of KCM - the GTK3 preview button should disappear too
# Bring back the deleted/renamed files
# Reopen KCM, the buttons should be present