Update notifications can't be turned off

When modifying a event (single or repeating make no difference) the checkbox "Notify attendees" can't be turned off.

The opposite to what is described in "bug #601747 meeting notifications not sent" happens in latest version (0.7):
Any modification is forwared all members of the un-visible attendee list. You can't avoid that - enabling the checkbox should help here.

I do understand that Simons comment in bug #601747 says "haven't dealt with notifications yet & help appreciated" but it seems this has actually changed in the mean time.

The follwing fraction from http://mxr.mozilla.org/comm-central/source/calendar/providers/gdata/components/calGoogleUtils.js seems to show some details how this is done in calGoogleUtils.js - maybe it helps to find the right knob to turn on.

  358 // Don't notify attendees by default. Use a preference in case the user
  359 // wants this to be turned on.
  360 var notify = getPrefSafe("calendar.google.sendEventNotifications", false);
  361 entry.gCal::sendEventNotifications.@value = (notify ? "true" : "false");

Thanks.