fix(sliceview): revised fix for cross-section display of low-rank volumetric sources
fix(sliceview): revised fix for cross-section display of low-rank volumetric sources

The fix introduced by f9ecace14e6e935f99e511a60db2176672c61d19 was subject to numerical precision
issues leading to chunks sometimes being excluded incorrectly.

This commit mitigates that problem by taking the depth range into account in
getNormalizedChunkLayout.

google/neuroglancer,janelia-flyem/neuroglancer,janelia-flyem/neuroglancer,google/neuroglancer,google/neuroglancer,google/neuroglancer,janelia-flyem/neuroglancer,google/neuroglancer,janelia-flyem/neuroglancer,google/neuroglancer,janelia-flyem/neuroglancer,google/neuroglancer,google/neuroglancer