#770: hang all our windows from the root window instead of the "world…

… window", this fixes applications which expect the "top level window" to hang directly off the root window (ie: Java)

git-svn-id: https://xpra.org/svn/Xpra/trunk@8484 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/x11/server.py

@@ -139,7 +139,8 @@ def _elect_me(self, model):
             return (-1, self)
 
     def take_window(self, model, window):
-        window.reparent(self.window, 0, 0)
+        root = self.window.get_screen().get_root_window()
+        window.reparent(root, 0, 0)
 
     def window_size(self, model):
         w, h = self._models[model].geom[2:4]