Function layoutGroup

apps/sim/lib/workflows/autolayout/targeted.ts:159–292

* Layouts a group of blocks (either root level or within a container). * Only repositions blocks in `changedSet` or those with invalid positions. * Resized existing blocks remain anchored and instead drive shifts in nearby * frozen blocks when their new dimensions create overlap.

(
  parentId: string | null,
  childIds: string[],
  blocks: Record<string, BlockState>,
  edges: Edge[],
  changedSet: Set<string>,
  resizedSet: Set<string>,
  shiftSourceSet: Set<string>,
  verticalSpacing: number,
  horizontalSpacing: number,
  subflowDepths: Map<string, number>,
  gridSize?: number
)

 * frozen blocks when their new dimensions create overlap.
 */
function layoutGroup(
  parentId: string | null,
  childIds: string[],
  blocks: Record<string, BlockState>,
  edges: Edge[],
  changedSet: Set<string>,
  resizedSet: Set<string>,
  shiftSourceSet: Set<string>,
  verticalSpacing: number,
  horizontalSpacing: number,
  subflowDepths: Map<string, number>,
  gridSize?: number
): void {
  if (childIds.length === 0) return

  const parentBlock = parentId ? blocks[parentId] : undefined

  const layoutEligibleChildIds = filterLayoutEligibleBlockIds(childIds, blocks)

  if (layoutEligibleChildIds.length === 0) {
    if (parentBlock) {
      updateContainerDimensions(parentBlock, childIds, blocks)
    }
    return
  }

  const requestedLayout = layoutEligibleChildIds.filter((id) => {
    const block = blocks[id]
    if (!block) return false
    return changedSet.has(id)
  })
  const invalidPositions = layoutEligibleChildIds.filter((id) => {
    const block = blocks[id]
    if (!block) return false
    return !hasFinitePosition(block)
  })
  const needsLayoutSet = new Set([...requestedLayout, ...invalidPositions])
  const needsLayout = Array.from(needsLayoutSet)
  const resizedAnchorIds = layoutEligibleChildIds.filter((id) => resizedSet.has(id))
  const groupShiftSourceIds = layoutEligibleChildIds.filter((id) => shiftSourceSet.has(id))
  const activeShiftSourceSet = new Set([
    ...needsLayoutSet,
    ...resizedAnchorIds,
    ...groupShiftSourceIds,
  ])

  if (needsLayout.length === 0 && activeShiftSourceSet.size === 0) {
    if (parentBlock) {
      updateContainerDimensions(parentBlock, childIds, blocks)
    }
    return
  }

  if (needsLayout.length > 0) {
    const oldPositions = new Map<string, { x: number; y: number }>()
    for (const id of layoutEligibleChildIds) {
      const block = blocks[id]
      if (!block) continue