column '{colId}' spans {n} rows, more than the {limit}-row span look-back; it will be clipped once its origin scrolls past that distance

Warnings reference › span-lookback:*

Identifier

span-lookback:*

Raised by

The grid (rendering)

Since

1.0.1

What happened

A cell span is taller than the number of rows the renderer looks back over when deciding what to paint. While the span's first row is near the viewport it draws correctly; once that origin row has scrolled further than the look-back, the renderer no longer knows the span is there and it is clipped.

The fix

Keep spans shorter than the look-back, or raise the look-back if the taller spans are genuinely needed - the cost is a longer scan on every paint.

Reference

Covered in full at the API reference.