_get_row_ranges(self, rows, col_slice)
This gains performance improvement over brute force by more efficient skipping of zeros, by accessing the elements column-wise in order.
Rows indexed. If range, must be within valid bounds.
Columns indexed
Fast path for indexing in the case where column index is slice.
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Using a canvas is more power efficient and can get hundred of nodes ; but does not allow hyperlinks; , arrows or text (beyond on hover)
SVG is more flexible but power hungry; and does not scale well to 50 + nodes.
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