Method getItemHeight

src/utils/VirtualScroller.ts:251–253

* Get the height of an item (measured or estimated)

(index: number)

	 * Get the height of an item (measured or estimated)
	 */
	private getItemHeight(index: number): number {
		return this.itemHeights.get(index) ?? this.estimatedHeight;
	}

	/**
	 * Get the position (top offset) of an item