Advanced React Flow Patterns Gates (check before shipping) Use these as sequenced checks—not “I think it works.” 1. Sub-flows / groups: Pass: Every matches an existing node ; the parent is registered in ; child positions are relative to the parent as intended (spot-check one drag inside/outside the group). 2. Custom connection line: Pass: With a valid/invalid drag, stroke or visibly differs; path renders without console errors from (invalid coords). 3. External drag-and-drop: Pass: always ; drop position uses (not raw / as flow coords); new node appears under the cursor on the pane. 4. Undo/r…