Use center rather than top position of anchor for bucket-on-screen test #5526
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Use the position of the center of an anchor instead of the top to determine whether it should be counted as off-screen or not. Since buckets in the bucket bar are drawn where the center is, this ensures that on-screen buckets merge into off-screen ones at a natural point, instead of when there is still a gap between the two (for the "above screen" bucket) or after the on-screen bucket has gone below the "below screen" bucket.
Fixes #5525