From d0e1ac2d423a00ecc42ad83de1bf606174b27f64 Mon Sep 17 00:00:00 2001
From: Vladimir Kharitonov <kharitonov.vladimir.1@gmail.com>
Date: Thu, 12 Jan 2023 16:47:19 +0000
Subject: [PATCH] mac: Fix OSR scaling behavior when switching displays (fixes
 issue #3423)

---
 libcef/browser/osr/render_widget_host_view_osr.cc | 1 +
 tests/cefclient/browser/browser_window_osr_mac.mm | 1 +
 2 files changed, 2 insertions(+)

diff --git a/libcef/browser/osr/render_widget_host_view_osr.cc b/libcef/browser/osr/render_widget_host_view_osr.cc
index 0b88fb37e..811acce41 100644
--- a/libcef/browser/osr/render_widget_host_view_osr.cc
+++ b/libcef/browser/osr/render_widget_host_view_osr.cc
@@ -1053,6 +1053,7 @@ void CefRenderWidgetHostViewOSR::SynchronizeVisualProperties(
 
 void CefRenderWidgetHostViewOSR::OnScreenInfoChanged() {
   TRACE_EVENT0("cef", "CefRenderWidgetHostViewOSR::OnScreenInfoChanged");
+  InvalidateLocalSurfaceId();
   if (!render_widget_host_)
     return;
 
diff --git a/tests/cefclient/browser/browser_window_osr_mac.mm b/tests/cefclient/browser/browser_window_osr_mac.mm
index 9317f4cc2..e5603d9ae 100644
--- a/tests/cefclient/browser/browser_window_osr_mac.mm
+++ b/tests/cefclient/browser/browser_window_osr_mac.mm
@@ -1183,6 +1183,7 @@ NSPoint ConvertPointFromWindowToScreen(NSWindow* window, NSPoint point) {
 }
 
 - (void)viewDidChangeBackingProperties {
+  [super viewDidChangeBackingProperties];
   const CGFloat device_scale_factor = [self getDeviceScaleFactor];
 
   if (device_scale_factor == device_scale_factor_)