useElementSize doesn't work when used on <svg> element

[callumacrae]

https://chromestatus.com/feature/5724912467574784

SVGElement.offsetWidth doesn't exist anymore, so useElementSize() always returns 0.

I've fixed this locally by replacing offsetWidth with getBoundingClientRect(), but wanted to discuss that before sending a PR as it's a breaking change per this answer on Stack Overflow.

One way around the breaking change would be to check whether the element is an HTML element or SVG element before calling getBoundingClientRect() - would that be good for you?

[juliencrn]

Hi, useElementSize has been deprecated and should be replaced by useResizeObserver. It doesn't support svg, but you can wrap this svg in a div to have the expected behavior.