Comment 7 for bug 1838551

"*does* do an update, but only if the IDs don't match. Which is a best unexpected, and at worst might appear random."

Wow. What is this ID? I based my comments on the observed behavior. Even though I'm above an average user, at least above a novice, in knowledge of the internals it looks like I still don't understand what this actually does.

Is this an advanced option which shouldn't normally be used?