How to reboot the jquery plugin.nicescroll in a modal window, when you expand the list?

Good day!

there is a hidden block with a text, the disclosure fails to restart a non-standard scroll (jquery.nicescroll)
the text below is clipped(((

link to example https://jsfiddle.net/alexscus/kf160cd0/41/
June 8th 19 at 17:11

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