From 1ceaab06aa681141c8ed72b966a2dc6f0841f9e2 Mon Sep 17 00:00:00 2001
From: roytam1 <roytam@gmail.com>
Date: Tue, 26 May 2026 10:23:03 +0800
Subject: [PATCH] import from UXP: [layout] Hide accessible carets when needed.
 (4bf23690)

---
 layout/base/AccessibleCaretManager.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/layout/base/AccessibleCaretManager.cpp b/layout/base/AccessibleCaretManager.cpp
index 2b865640b..d9acc7462 100644
--- a/layout/base/AccessibleCaretManager.cpp
+++ b/layout/base/AccessibleCaretManager.cpp
@@ -408,11 +408,21 @@ AccessibleCaretManager::UpdateCaretsForSelectionMode(UpdateCaretsHint aHint)
 
   if (firstCaretResult == PositionChangedResult::Changed ||
       secondCaretResult == PositionChangedResult::Changed) {
+    nsWeakFrame weakStartFrame = startFrame;
+    nsWeakFrame weakEndFrame = endFrame;
+
     // Flush layout to make the carets intersection correct.
     FlushLayout();
     if (IsTerminated()) {
       return;
     }
+    if ((startFrame && !weakStartFrame.IsAlive()) ||
+        (endFrame && !weakEndFrame.IsAlive())) {
+      mFirstCaret.get()->SetAppearance(Appearance::NormalNotShown);
+      mSecondCaret.get()->SetAppearance(Appearance::NormalNotShown);
+      DispatchCaretStateChangedEvent(CaretChangedReason::Visibilitychange);
+      return;
+    }
   }
 
   if (aHint == UpdateCaretsHint::Default) {