From 0cc049946eb9f1554bd3f5db00d65419a35f2f9f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Sat, 27 May 2023 06:55:41 +0200
Subject: [PATCH] style: Fix layer statement with nested layer names

When we had:

  @layer A.B;

We were registering "A" and "B", not "A" and "A.B", which was the intention.

Fix is trivial.

Depends on D124620

Differential Revision: https://phabricator.services.mozilla.com/D124621
---
 components/style/stylist.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/style/stylist.rs b/components/style/stylist.rs
index cd05ee42f76..4be6e035378 100644
--- a/components/style/stylist.rs
+++ b/components/style/stylist.rs
@@ -2404,9 +2404,13 @@ impl CascadeData {
                         }
                         LayerRuleKind::Statement { ref names } => {
                             for name in &**names {
+                                let mut pushed = 0;
                                 for name in name.layer_names() {
                                     current_layer.0.push(name.clone());
                                     maybe_register_layer(self, &current_layer);
+                                    pushed += 1;
+                                }
+                                for _ in 0..pushed {
                                     current_layer.0.pop();
                                 }
                             }