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Fixes #1677.
The code was confusing the plot being faceted vs. the current mark being faceted. If the plot is faceted, but the current mark is not faceted, we still need to populate the index.fx, index.fy, and index.fi fields so that the mark knows which facet is being rendered. Since the index is reused across facets, we create a defensive copy so that these fields aren’t mutated after the mark renders (e.g., in the case of an asynchronous render transform). We use index.subarray if the index is a typed array, which should be faster than create a copy using index.slice.