Also, to be really sure one would have to reload _all_ snapshots.
Which reminds me of a related issue. Ardour does the right thing
for 'save as' and 'new snapshot' in that the latter does not
change the current session name used by 'save'. However, when
a snapshot is reloaded it does become the current session and
it will be overwritten by 'save', which may not be what the
user intended.