Set focus on text box control on hotkey invoke (#1859)

src/modules/windowwalker/app/Window Walker/MainWindow.xaml

@@ -21,7 +21,8 @@
         TextElement.FontSize="14"
         FontFamily="pack://application:,,,/MaterialDesignThemes.Wpf;component/Resources/Roboto/#Roboto"
         Deactivated="Window_Deactivated"
-        ShowInTaskbar="false">
+        ShowInTaskbar="false"
+        GotFocus="Window_GotFocus">
     
     <Window.Resources>
         <ResourceDictionary>    

src/modules/windowwalker/app/Window Walker/MainWindow.xaml.cs

@@ -114,5 +114,10 @@ namespace WindowWalker
                 viewModel.WindowHideCommand.Execute(null);
             }
         }
+
+        private void Window_GotFocus(object sender, RoutedEventArgs e)
+        {
+            this.searchBox.Focus();
+        }
     }
 }