About

Variable row height is switched on with options.enableVariableRowHeight; the heights come from the single options.rowHeightProvider source. The main grid supplies its own provider (every 5th row 32px, every 13th row 70px, else the default rowHeight of 25px). The second grid configures no provider: the built-in default provider reads ItemMetadata.height from getItemMetadata(row), so metadata-driven heights work with just the switch.

Controls

Scroll row 5,000 to top Grow row 2 by 10px (invalidateRowHeights) Run geometry self-checks