From f1699407426e4664061a5effb022ddbd8f27a925 Mon Sep 17 00:00:00 2001
From: FranklinDM <mrmineshafter17@gmail.com>
Date: Fri, 24 Mar 2023 19:34:55 +0800
Subject: [PATCH] Issue #2135 - Don't discard event state mask when matching
 ::slotted() or :host arguments

This should fix issues with selectors like :host(:hover) that continue to be matched although the cursor is no longer hovering over those elements.
---
 layout/style/nsCSSRuleProcessor.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/layout/style/nsCSSRuleProcessor.cpp b/layout/style/nsCSSRuleProcessor.cpp
index 55b7293f6a..6b25ae0dde 100644
--- a/layout/style/nsCSSRuleProcessor.cpp
+++ b/layout/style/nsCSSRuleProcessor.cpp
@@ -1997,11 +1997,9 @@ static bool SelectorMatches(Element* aElement,
             return false;
           }
 
-          NodeMatchContext nodeContext(EventStates(),
-                                       aNodeMatchContext.mIsRelevantLink);
           if (!SelectorListMatches(aElement,
                                    pseudoClass,
-                                   nodeContext,
+                                   aNodeMatchContext,
                                    aTreeMatchContext)) {
             return false;
           }
@@ -2049,7 +2047,7 @@ static bool SelectorMatches(Element* aElement,
           // Match if any selector in the argument list matches.
           // FIXME: What this effectively does is bypass the "featureless"
           // selector check under SelectorMatches.
-          NodeMatchContext nodeContext(EventStates(),
+          NodeMatchContext nodeContext(aNodeMatchContext.mStateMask,
                                        aNodeMatchContext.mIsRelevantLink);
           if (!SelectorListMatches(aElement,
                                    pseudoClass,