1
what are the thresholds for?
this was the result of a change of topic title where the event block is not in the OP - posts were merged in with preservation of chronology.
The history was shown on an edit notification for not the first post of the topic, nor the historic first post. The user with the edit notification isn’t watching the topic
zogstrip 2
It’s a little complicated 
So the code sets a budget: a maximum number of comparisons it’s allowed to make before it must stop and say “this is too hard.”
How the budget is calculated?
What happens when the budget runs out?
DiffLimitExceeded) rather than letting the server grind away for seconds or minutes 
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