title: Tkinter space between widgets keeps growing
body: <p>I'm trying to get a paned widget to grow with a form but whenever I pull the window down vertically, the gap between the paned widget and the status bar grows.</p>
  <pre><code>from tkinter import *
  
  root = Tk()
  
  pw = PanedWindow(root, orient='horizontal')
  
  red = LabelFrame(pw, text='red')
  Label(red, text='something', anchor='w').grid(row=1, column=1)
  
  blue = LabelFrame(pw, text='blue')
  Label(blue, text='anything', anchor='w').grid(row=1, column=1)
  
  pw.add(red, stretch='always')
  pw.add(blue, stretch='always')
  
  status = Label(root, text='Status', relief=SUNKEN)
  
  pw.pack(expand=True, fill=BOTH)
  status.pack(side=BOTTOM, expand=True, fill=X)
  
  root.mainloop()
  </code></pre>
  <p>Is there a way of stopping the gap between the status bar and the bottom of the window and the gap between the status bar and the paned widget from growing?</p>