code: def remove_pane(self, pane):
          
          assert isinstance(pane, Pane)
  
          if pane in self.panes:
              # When this pane was focused, switch to previous active or next in order.
              if pane == self.active_pane:
                  if self.previous_active_pane:
                      self.active_pane = self.previous_active_pane
                  else:
                      self.focus_next()
  
              # Remove from the parent. When the parent becomes empty, remove the
              # parent itself recursively.
              p = self._get_parent(pane)
              p.remove(pane)
  
              while len(p) == 0 and p != self.root:
                  p2 = self._get_parent(p)
                  p2.remove(p)
                  p = p2
  
              # When the parent has only one item left, collapse into its parent.
              while len(p) == 1 and p != self.root:
                  p2 = self._get_parent(p)
                  p2.weights[p[0]] = p2.weights[p]  # Keep dimensions.
                  i = p2.index(p)
                  p2[i] = p[0]
                  p = p2
docs: Remove pane from this Window.