Function scrollUp

src/components/ScrollKeybindingHandler.tsx:873–882

(s: ScrollBoxHandle, amount: number)

// can cover and intermediate drain frames render at scrollTops with no
// mounted children — blank viewport.
export function scrollUp(s: ScrollBoxHandle, amount: number): void {
  // Include pendingDelta: scrollBy accumulates without updating scrollTop,
  // so getScrollTop() alone is stale within a batch of wheel events.
  const effectiveTop = s.getScrollTop() + s.getPendingDelta();
  if (effectiveTop - amount <= 0) {
    s.scrollTo(0);
    return;
  }
  s.scrollBy(-amount);
}
export type ModalPagerAction = 'lineUp' | 'lineDown' | 'halfPageUp' | 'halfPageDown' | 'fullPageUp' | 'fullPageDown' | 'top' | 'bottom';

/**