clauderic / clauderic/react-sortable-hoc

Workaround for mozilla bug doesn't work since Firefox 62

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Description

Related pull request: https://github.com/clauderic/react-sortable-hoc/pull/106

Since Firefox version 62, window.getComputedStyle() returns a CSSStyleDeclaration object with length 0 (instead of null) inside an iframe with display: none.
See this comment: https://bugzilla.mozilla.org/show_bug.cgi?id=548397#c53.

CSSStyleDeclaration object with length 0 is not a falsy value, so the previous fix does not work and vendorPrefix gets an empty string value.

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