[EuiSelectableTemplateSitewide] Clicking on any virtualized options causes scroll to top

[wenchonglee]

Hey,

I've been trying out EuiSelectableTemplateSitewide and I quite like it so far.

I noticed this behavior where clicking any of the options past the first few rendered by react-window will cause the list to be scrolled to the top. You can currently reproduce this by going to the example and searching 'a', then clicking on the last option.

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Subsequent clicks would work, so having focus on the popover seems to do the trick. Is there a proper workaround or is there an underlying issue?

p.s. I wasn't sure if I should raise an issue for a minor problem like this:
the changelog entry from my PR #4072 had a merge issue and was misplaced in the 29.2.0 section.