Fix a few offset indexing bugs #28100
Merged
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While attempting to port ImageFiltering I found a few indexing bugs. Two (or perhaps all 3) are probably consequences of #27038, for which I think the balance of arguments is clearly positive, though also a very deep change that we should expect will have a few more undetected consequences.
As I am about to be incommunicado for a couple of weeks, I'm basically tossing this over the fence for someone else to pick up.