From 5b184f448b6da5b9ae00c0df6559f48849f6fa15 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Wed, 14 Jun 2023 20:50:16 +0000
Subject: [PATCH] style: Fix style invalidation on layer rule insertion

Layer insertion may change the order of styles, so we may need to fully
invalidate.

Without this change, bug 1838045 makes
layer-statement-before-import.html fail.

Differential Revision: https://phabricator.services.mozilla.com/D180929
---
 components/style/invalidation/stylesheets.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/components/style/invalidation/stylesheets.rs b/components/style/invalidation/stylesheets.rs
index 6326a15e61a..6ae67452dbd 100644
--- a/components/style/invalidation/stylesheets.rs
+++ b/components/style/invalidation/stylesheets.rs
@@ -548,12 +548,16 @@ impl StylesheetInvalidationSet {
                 // It's not clear what handling changes for this correctly would
                 // look like.
             },
+            LayerStatement(..) => {
+                // Layer statement insertions might alter styling order, so we need to always
+                // invalidate fully.
+                return self.invalidate_fully();
+            },
             CounterStyle(..) |
             Page(..) |
             Property(..) |
             FontFeatureValues(..) |
             FontPaletteValues(..) |
-            LayerStatement(..) |
             FontFace(..) |
             Keyframes(..) |
             Container(..) |