title: UWP in Fullscreen Mode, KeyDown stops working with Keyboard Barcodescanner
body: <p>When i scan a Barcode with my scanner (for the PC the scanner is a Keyboard, it don't know that it is a Barcodescanner) sometimes in fullscreen mode the KeyDown Event isn't handled until i move my mouse a little bit.</p>
  
  <p>as you can see:
  <a href="https://i.stack.imgur.com/ODOv3.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ODOv3.gif" alt="enter image description here"></a></p>
  
  <p>it seems like the program is losing the focus at some point. when i try it without the fullscreen mode it works like it should.</p>
  
  <p><a href="https://i.stack.imgur.com/RObBV.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RObBV.gif" alt="enter image description here"></a></p>
  
  <p>i already used this 4 methodes to get the key, but all have the same behaviour:</p>
  
  <pre><code>Windows.UI.Core.CoreWindow.GetForCurrentThread().CharacterReceived += MainPage_CharacterReceived;
  Windows.UI.Core.CoreWindow.GetForCurrentThread().KeyDown += MainPage_KeyDown; ;
  
  Window.Current.CoreWindow.Dispatcher.AcceleratorKeyActivated += Dispatcher_AcceleratorKeyActivated;
  
  Window.Current.CoreWindow.KeyDown += CoreWindow_KeyDown;
  </code></pre>
  
  <p>is that bug well known already and is there anything i could do, to prevent that from happening?</p>