[fix] applying :global for > combinator (#6563)

src/compiler/compile/css/Selector.ts

@@ -227,7 +227,8 @@ function apply_selector(blocks: Block[], node: Element, to_encapsulate: Array<{
 
 			return false;
 		} else if (block.combinator.name === '>') {
-			if (apply_selector(blocks, get_element_parent(node), to_encapsulate)) {
+			const has_global_parent = blocks.every(block => block.global);
+			if (has_global_parent || apply_selector(blocks, get_element_parent(node), to_encapsulate)) {
 				to_encapsulate.push({ node, block });
 				return true;
 			}

test/css/samples/global-with-child-combinator-2/_config.js

@@ -0,0 +1,27 @@
+export default {
+	warnings: [
+		{
+			code: 'css-unused-selector',
+			end: {
+				character: 111,
+				column: 21,
+				line: 8
+			},
+			frame: `
+			 6:     color: red;
+			 7:   }
+			 8:   a:global(.foo) > div {
+			      ^
+			 9:     color: red;
+			10:   }
+			`,
+			message: 'Unused CSS selector "a:global(.foo) > div"',
+			pos: 91,
+			start: {
+				character: 91,
+				column: 1,
+				line: 8
+			}
+		}
+	]
+};

test/css/samples/global-with-child-combinator-2/expected.css

@@ -0,0 +1 @@
+div>div.svelte-xyz.svelte-xyz{color:red}div.svelte-xyz.foo>div.svelte-xyz{color:red}

test/css/samples/global-with-child-combinator-2/expected.html

@@ -0,0 +1,3 @@
+<div class="svelte-xyz">
+  <div class="svelte-xyz"></div>
+</div>

test/css/samples/global-with-child-combinator-2/input.svelte

@@ -0,0 +1,15 @@
+<style>
+	:global(div) > div {
+		color: red;
+	}
+	div:global(.foo) > div {
+		color: red;
+	}
+	a:global(.foo) > div {
+		color: red;
+	}
+</style>
+
+<div>
+	<div />
+</div>

test/css/samples/global-with-child-combinator-3/_config.js

@@ -0,0 +1,3 @@
+export default {
+	warnings: []
+};

test/css/samples/global-with-child-combinator-3/expected.css

@@ -0,0 +1 @@
+a>b>div.svelte-xyz{color:red}

test/css/samples/global-with-child-combinator-3/expected.html

@@ -0,0 +1,3 @@
+<div class="svelte-xyz">
+  <div class="svelte-xyz"></div>
+</div>

test/css/samples/global-with-child-combinator-3/input.svelte

@@ -0,0 +1,9 @@
+<style>
+	:global(a) > :global(b) > div {
+		color: red;
+	}
+</style>
+
+<div>
+	<div />
+</div>

test/css/samples/global-with-child-combinator/expected.html

@@ -0,0 +1,3 @@
+<div class="svelte-xyz">
+  <div class="svelte-xyz"></div>
+</div>