fix: correctly scope CSS selectors with descendant combinators (#10502)

* fix traversal, but break some other stuff

* man this is fucken hard

* fixes

* getting closer

* be conservative for now

* tidy

* invert

* invert

* simplify

* switch

* for now

* progress

* i think it works?

* fix

* tidy up

* revert some stuff

* remove some junk

* handle weird cases

* update

* tweak

* shrink

* changeset

---------

Co-authored-by: Rich Harris <[email protected]>

Author: Rich-Harris

.changeset/beige-mirrors-listen.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: correctly scope CSS selectors with descendant combinators

packages/svelte/src/compiler/phases/1-parse/read/style.js

@@ -114,7 +114,8 @@ function read_rule(parser) {
 		start,
 		end: parser.index,
 		metadata: {
-			parent_rule: null
+			parent_rule: null,
+			has_local_selectors: false
 		}
 	};
 }