Dragging one workspace onto another could pick a nested child as the
"nearest" drop target instead of the visible parent card the user
actually hovered. The effect: dropping a free-floating Hermes Agent
onto a Claude Code Agent that already had a Hermes Agent nested inside
showed "Move 'Hermes Agent' inside 'Hermes Agent'?" — the confirmation
referenced the nested same-named child, not Claude Code.
Why: getIntersectingNodes returns every overlapping node, including
hidden=true children that render inside their parent's card. The
parent and child share bounding boxes, so the child often "won" the
nearest-distance check. Filter them out at the source: a node that's
already got a parentId (or is hidden) is never a valid top-level drop
target.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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