RowBlocks

Row blocks: runs of adjacent rows that render and drag as one unit, declared by identity rather than by position — the library derives block extents from the same snapshot it renders, so they cannot go stale against an asynchronously filtered list. The consumer's data stays untouched during a gesture; the move arrives as one event at drop.

Passing a RowBlocks supersedes the per-row onRowMove: drag units are blocks, so every unit gesture reports through onCommit instead (a standalone move carries a null RowBlockMove.blockId). Dragging is split in two — the whole block moves from a handle in blockHeader, while each row moves within its own block from its cell handle.

Hold the instance in remember: it compares by identity, so a fresh instance per recomposition stops the table from skipping. A stable rowKey is required — move anchors are row keys.