Missing files + start working on offline patcher

SafeExamBrowser.Browser/Handlers/FocusHandler.cs

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2025 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using CefSharp;
+
+namespace SafeExamBrowser.Browser.Handlers
+{
+	internal class FocusHandler : IFocusHandler
+	{
+		internal FocusHandler()
+		{
+		}
+
+		public void OnGotFocus(IWebBrowser webBrowser, IBrowser browser)
+		{
+		}
+
+		public bool OnSetFocus(IWebBrowser webBrowser, IBrowser browser, CefFocusSource source)
+		{
+			return false;
+		}
+
+		public void OnTakeFocus(IWebBrowser webBrowser, IBrowser browser, bool next)
+		{
+		}
+	}
+}