Update draggable regions when changing BrowserView

Fixes #12150.

atom/browser/api/atom_api_browser_window.cc

@@ -1057,6 +1057,10 @@ void BrowserWindow::SetBrowserView(v8::Local<v8::Value> value) {
     window_->SetBrowserView(browser_view->view());
     browser_view->web_contents()->SetOwnerWindow(window_.get());
     browser_view_.Reset(isolate(), value);
+
+#if defined(OS_MACOSX)
+    UpdateDraggableRegions(nullptr, draggable_regions_);
+#endif
   }
 }