Function addChangedCells

frontend/src/maps.tsx:157–164

(previous: Set<string>, next: Set<string>, changed: Set<string>)

}

function addChangedCells(previous: Set<string>, next: Set<string>, changed: Set<string>) {
  for (const cellId of previous) {
    if (!next.has(cellId)) changed.add(cellId);
  }
  for (const cellId of next) {
    if (!previous.has(cellId)) changed.add(cellId);
  }
}

function cloneCellStyleState(
  unlocked: Set<string>,