Function applyTargetedLayout

apps/sim/lib/workflows/autolayout/targeted.ts:42–117

(
  blocks: Record<string, BlockState>,
  edges: Edge[],
  options: TargetedLayoutOptions
)

 * Unchanged blocks act as anchors to preserve existing layout.
 */
export function applyTargetedLayout(
  blocks: Record<string, BlockState>,
  edges: Edge[],
  options: TargetedLayoutOptions
): Record<string, BlockState> {
  const {
    changedBlockIds,
    resizedBlockIds = [],
    shiftSourceBlockIds = [],
    verticalSpacing = DEFAULT_VERTICAL_SPACING,
    horizontalSpacing = DEFAULT_HORIZONTAL_SPACING,
    gridSize,
  } = options

  if (
    (!changedBlockIds || changedBlockIds.length === 0) &&
    resizedBlockIds.length === 0 &&
    shiftSourceBlockIds.length === 0
  ) {
    return blocks
  }

  const changedSet = new Set(changedBlockIds)
  const resizedSet = new Set(resizedBlockIds)
  const shiftSourceSet = new Set(shiftSourceBlockIds)
  const blocksCopy: Record<string, BlockState> = structuredClone(blocks)

  prepareContainerDimensions(
    blocksCopy,
    edges,
    layoutBlocksCore,
    horizontalSpacing,
    verticalSpacing,
    gridSize
  )

  const groups = getBlocksByParent(blocksCopy)

  const subflowDepths = calculateSubflowDepths(blocksCopy, edges, assignLayers)

  layoutGroup(
    null,
    groups.root,
    blocksCopy,
    edges,
    changedSet,
    resizedSet,
    shiftSourceSet,
    verticalSpacing,
    horizontalSpacing,
    subflowDepths,
    gridSize
  )

  for (const [parentId, childIds] of groups.children.entries()) {
    layoutGroup(
      parentId,
      childIds,