title: Tkinter app disappears when exiting full screen
body: <p>I have a python tkinter application and want to display it in full screen when starting it (in Ubuntu if that matters). So I used <code>Tk.attributes('-zoomed', True)</code>. If I pull the window out of full screen with the mouse it just disappears. I can still see the application's icon - so it's still open - but I can only see my empty desktop and clicking on the icon doesn't make it visible either.
  When I define the window's size with <code>Tk.geometry('1500x800')</code>, then make it full screen and exit full screen again like before it doesn't disappear.
  What could be the reason for that?</p>
  <p>Thanks in advance.</p>
  <p>edit: I'm sorry, I wrote the question from memory and it's been I while since I wrote that and Tk is not my real variable name. Here is the actual code:</p>
  <pre><code>def __init__(self, *args, **kwargs):
          tk.Tk.__init__(self, *args, **kwargs)
          
          # Set the window's size
          self.geometry('1500x800') # set size manually
          # self.attributes('-zoomed', True) # fullscreen with toolbar
          # self.attributes('-fullscreen', True) # fullscreen
  </code></pre>
  <p>...</p>