The formula cell being rendered (styling source: font, alignment, insets).
The cell's unzoomed size — what the text is placed against (ICell.getTextPlacement).
The formula's tokens (createFormula(cell.getFormulaText(), …).getTokens()).
Rendered verbatim after a leading =, each span colored by tokenColor — reference
tokens rotate the shared --sxl-color-series-* palette by referenceIndex, the SAME hues the
range picker outlines with, so text and rectangle always match.
The pane's zoom (the hosting box's bounds are zoomed; fonts must match).
Props for CellFormulaRenderer.