Accordion control does not work with dynamically sized content

[SimonDarksideJ]

^{Issue created by <unknown> as Bitbucket Issue #​238 on 2018.05.10 10:27.}

• Create an accordion control.
• Put text in the panes.
• Run - works nicely.
• Remove text from a pane, replace with a scroll view
• Add text items to the scroll view content pane (along with content size fitter and vertical layout etc)
• The scroll view's scroll bars are rendered outside of the accordion control and when the user tries to open the respective pane, it fails.
• Diagnosis: the GetExpandedHeight() method of UIAccordionElement does not correctly compute the height of dynamic content.