Method getItemPosition

src/utils/VirtualScroller.ts:258–261

* Get the position (top offset) of an item

(index: number)

	 * Get the position (top offset) of an item
	 */
	private getItemPosition(index: number): number {
		if (index < 0 || index >= this.positionCache.length) return 0;
		return this.positionCache[index];
	}

	/**
	 * Rebuild the position cache from measured heights