@supports rule raises inspection error in LessCSS

Using nested `@supports` rules creates an inspection error even though it's valid LessCSS. 

.some_selector {
margin-top: 20px;

@supports (position: sticky) {
margin-top: 6px;

This is correct Less code: http://lesscss.org/#nesting-nested-at-rules-and-bubbling
It also compiles correctly without warning, but raises an inspection error in PhpStorm 2019.1. 



Note: this is not the same as this other issue, since it's in Less and not CSS / SCSS. In the other issue there hasn't been any response since October, I guess because this syntax is not valid in CSS (it definitely is in Less though). 

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