Fix lazy kernel slicing when there are multiple outputs #2376
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Fixes a bug when slicing a lazy kernel and the number of outputs per row or column is greater than one.
The master implementation incorrectly checks to see if x1 and x2 are both slices. This always fails and defaults to the super method.
This PR fixes that check to ensure that row_index and col_index are slices.
The changes on the other lines are necessary to catch situations where the start point or end point of the slicing is implicit.