Fix DCHECK adding menu separator with hidden items (fixes #3577)

patch/patch.cfg

@@ -829,5 +829,11 @@ patches = [
     # cef_sandbox with VS 17.9.2 version of MSVC STL.
     # https://github.com/chromiumembedded/cef/issues/3708
     'name': 'win_sandbox_op3way_3708'
+  },
+  {
+    # Fix DCHECK in SimpleMenuModel::AddSeparator when adding a separator with
+    # hidden menu items.
+    # https://github.com/chromiumembedded/cef/issues/3577
+    'name': 'ui_menu_model_3577'
   }
 ]

patch/patches/ui_menu_model_3577.patch

@@ -0,0 +1,23 @@
+diff --git ui/base/models/simple_menu_model.cc ui/base/models/simple_menu_model.cc
+index 88e27362452e5..9c18ac5c77544 100644
+--- ui/base/models/simple_menu_model.cc
++++ ui/base/models/simple_menu_model.cc
+@@ -10,6 +10,7 @@
+ #include "base/functional/bind.h"
+ #include "base/location.h"
+ #include "base/task/single_thread_task_runner.h"
++#include "cef/libcef/features/features.h"
+ #include "ui/base/l10n/l10n_util.h"
+ #include "ui/base/models/image_model.h"
+ #include "ui/gfx/image/image.h"
+@@ -170,8 +171,10 @@ void SimpleMenuModel::AddSeparator(MenuSeparatorType separator_type) {
+     }
+ 
+     if (items_.at(last_visible_item).type == TYPE_SEPARATOR) {
++#if !BUILDFLAG(ENABLE_CEF)
+       DCHECK_EQ(NORMAL_SEPARATOR, separator_type);
+       DCHECK_EQ(NORMAL_SEPARATOR, items_.at(last_visible_item).separator_type);
++#endif
+       // The last item is already a separator. Don't add another.
+       return;
+     }