Minifier incorrectly removes semicolon before nested child selectors (`& >`)

[lewisl9029]

Hi there! Really appreciate your work on Lightning CSS! It's been a joy to use in https://reflame.app, and every bit as fast as advertised! :)

Wanted to report what looks like a bug with the minifier. I've set up a minimal repro in this playground, also pasting the input/output below for convenience:

Input:

.container {
	display: flex;

	& > div {
		display: flex;
	}
}

Output:

.container{display:flex&>div{display:flex}}

Note the lack of a ; after display:flex. This gets interpreted like this in browsers:

Which is clearly not preserving the nesting functionality.

Note that if we turn off nesting, the ; after display:flex is preserved in the output, so I'm assuming this is a bug with the minifier.

I'm working around this at the moment by forcing lightningcss to transpile nesting syntax, which I was planning to do anyways until nesting is supported natively in firefox. So this is not super urgent as far as I'm concerned, but I wanted to put it on your radar anyways.

Cheers!