Function computeAgentRowRenderMeta

src/browser/utils/ui/workspaceFiltering.ts:369–489

(
  flattenedWorkspaces: FrontendWorkspaceMetadata[],
  depthByWorkspaceId: Record<string, number>,
  expandedParentIds: ReadonlySet<string> = new Set()
)

 * Build render metadata for visible rows in a flattened workspace tree.
 */
export function computeAgentRowRenderMeta(
  flattenedWorkspaces: FrontendWorkspaceMetadata[],
  depthByWorkspaceId: Record<string, number>,
  expandedParentIds: ReadonlySet<string> = new Set()
): Map<string, AgentRowRenderMeta> {
  const visibleRows = filterVisibleAgentRows(flattenedWorkspaces, expandedParentIds);
  const visibleWorkspaceIds = new Set(visibleRows.map((workspace) => workspace.id));

  const visibleChildrenByParent = new Map<string, FrontendWorkspaceMetadata[]>();
  const completedChildrenByParent = new Map<string, FrontendWorkspaceMetadata[]>();
  const visibleWorkspaceById = new Map<string, FrontendWorkspaceMetadata>();

  for (const workspace of visibleRows) {
    visibleWorkspaceById.set(workspace.id, workspace);

    const parentId = workspace.parentWorkspaceId;
    if (!parentId) {
      continue;
    }

    const siblings = visibleChildrenByParent.get(parentId) ?? [];
    siblings.push(workspace);
    visibleChildrenByParent.set(parentId, siblings);
  }

  for (const workspace of flattenedWorkspaces) {
    if (!workspace.parentWorkspaceId || !hasCompletedAgentReport(workspace)) {
      continue;
    }

    const completedChildren = completedChildrenByParent.get(workspace.parentWorkspaceId) ?? [];
    completedChildren.push(workspace);
    completedChildrenByParent.set(workspace.parentWorkspaceId, completedChildren);
  }

  const metadataByWorkspaceId = new Map<string, AgentRowRenderMeta>();

  for (const workspace of visibleRows) {
    const rowKind = workspace.parentWorkspaceId ? "subagent" : "primary";

    let connectorPosition: AgentRowRenderMeta["connectorPosition"] = "single";
    let connectorStartsAtParent = false;
    let sharedTrunkActiveThroughRow = false;
    let sharedTrunkActiveBelowRow = false;
    let ancestorTrunks: AgentRowRenderMeta["ancestorTrunks"] = [];

    if (workspace.parentWorkspaceId) {
      const siblings = visibleChildrenByParent.get(workspace.parentWorkspaceId) ?? [];
      const siblingIndex = siblings.findIndex((sibling) => sibling.id === workspace.id);
      if (siblings.length > 1) {
        connectorPosition = siblings[siblings.length - 1]?.id === workspace.id ? "last" : "middle";
      }

      if (siblingIndex >= 0) {
        connectorStartsAtParent = siblingIndex === 0;

        let lastRunningSiblingIndex = -1;
        for (let index = siblings.length - 1; index >= 0; index -= 1) {