Calling StylePropertyMap.set() with a `calc()` ends up dropping the calc.
Pull request: https://github.com/WebKit/WebKit/pull/6992
Committed 257291@main (f53b8be5211f): <https://commits.webkit.org/257291@main> Reviewed commits have been landed. Closing PR #6992 and removing active labels.
<rdar://problem/102909662>