// r : voidfunc(snippet ID), called in module queue
static AutoCloseable dm_onSnippetEdited(final VF1<S> r) {
  dm_requireSnippetUpdatesModule();
  final DynModule m = dm_current_mandatory();
  ret dm_vmBus_onMessage('snippetUpdate, voidfunc(fL l) {
    switch to m.q();
    S uri = getString(l, 1);
    new Matches m;
    if (swic(uri, "/edit/", m)) {
      S snippetID = fsI(firstIntAsString(m.rest()));
      callF(r, snippetID);
    }
  });
}

static AutoCloseable dm_onSnippetEdited(fS snippetID, final Runnable r) {
  ret dm_onSnippetEdited(voidfunc(S id) {
    if (sameSnippetID(id, snippetID)) callF(r)
  });
}

Began life as a copy of #1020439