Change tabIndex to MUST_USE_ATTRIBUTE to avoid special focus treatment in Chrome #5907
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Chrome treats anchor tags with an explicit
tabIndex='0'different then if the attribute was not present. Specifically when clicking a link with an implicit tab index (i.e. no attribute on the node) no focus outline is shown. Whereas with an explicit tabindex='0' it does get shown. This is super minor, but maintaining react-bootstrap has taught me that A LOT of people are VERY touchy about browser focus outlines.If anything this just makes the behavior consistent across browsers. (tested in recent FF, Chrome, and Edge)
example: https://jsfiddle.net/7kmck1f7/1/