command/format: Don't panic when item removed from list of objects #20765
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Due to these tests happening in the wrong order, removing an object from the end of a sequence of objects would previously cause a bounds-check panic. Rather than a more severe rework of the logic here, for now we'll just introduce an extra precondition to prevent the panic. The code that follows already handles the case where there _is_ no new object (i.e. the "old" object is being deleted) as long as we're able to pass through this type-checking logic. The new "JSON list of objects - removing item" test covers this problem by rendering a diff for an object being removed from the end of a list of objects within a JSON value.
jbardin
approved these changes
Mar 19, 2019
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Due to these tests happening in the wrong order, removing an object from the end of a sequence of objects would previously cause a bounds-check panic.
Rather than a more severe rework of the logic here, for now we'll just introduce an extra precondition to prevent the panic. The code that follows already handles the case where there is no new object (i.e. the "old" object is being deleted) as long as we're able to pass through this type-checking logic.
The new "JSON list of objects - removing item" test covers this problem by rendering a diff for an object being removed from the end of a list of objects within a JSON value.
This fixes #20750.