purging the network-manager snap does not clean /etc/netplan

[Oliver Grawert]

when purging NM, all the connection info stays around in /etc/netplan:

$ snap remove --purge network-manager
...
network-manager removed
$ ls /etc/netplan/
00-default-nm-renderer.yaml 90-NM-2b0d0f1d-b79d-43af-bde1-71744625642e.yaml 90-NM-4a224744-3bc7-31c9-8346-adcb6136990f.yaml

while i would expect this behaviour when just removing, i think --purge should actually remove all remaining config bits (and preferably restore the original netplan yaml files) ...