Function withLayoutItem

src/core/layout.ts:163–178

(
  layout: Layout,
  itemKey: string,
  cb: (item: LayoutItem) => LayoutItem
)

 * @returns Tuple of [new layout, modified item or null if not found]
 */
export function withLayoutItem(
  layout: Layout,
  itemKey: string,
  cb: (item: LayoutItem) => LayoutItem
): [LayoutItem[], LayoutItem | null] {
  let item = getLayoutItem(layout, itemKey);
  if (!item) {
    return [[...layout], null];
  }

  // Clone, then modify via callback
  item = cb(cloneLayoutItem(item));
  const newLayout = modifyLayout(layout, item);

  return [newLayout, item];
}

// ============================================================================
// Bounds Correction