UnderlineNav2: Use useIsomorphicLayoutEffect to make it SSR friendly #2625
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Closes #2617
This PR updates UnderlineNav using
useIsomorphicLayoutEffect
instead of React's defaultuseLayoutEffect
to make it SSR friendly.Note: UnderlineNav's initial layout rendering is very much depending on viewport size and JS being ran on the browser to calculate how many items that can fit into the current viewport. Because of that, this update causes an undesirable behaviour in SSR. Nothing blocking the functionality though it is just something we have not worked thoroughly. I'll work with the design team to think about a "loading state" (Thanks @joshblack for this terminology!) until we get JS running on the browser.
In the meantime, it believe this should solve the issue.
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