Function expandKey

src/components/Messages.tsx:399–401

Key for click-to-expand: tool_use_id where available (so tool_use + its * tool_result expand together), else uuid for groups/thinking.

(msg: RenderableMessage)

/** Key for click-to-expand: tool_use_id where available (so tool_use + its
 *  tool_result expand together), else uuid for groups/thinking. */
function expandKey(msg: RenderableMessage): string {
  return (msg.type === 'assistant' || msg.type === 'user' ? getToolUseID(msg) : null) ?? msg.uuid;
}

// Custom comparator to prevent unnecessary re-renders during streaming.
// Default React.memo does shallow comparison which fails when: