wx.BusyInfo does not stick to parent, stays on top of other applications

Dear all

I have some issues with wx.BusyInfo. I am not sure if I am doing something 
wrong, of if it's a bug in wxPython.

The wx.BusyInfo frame does not "stick" to its parent frame: it does not 
stay centered on the parent frame, and it does not move with the parent 
(like a normal modal dialog would). Also, maybe worse, if you bring another 
application to the front / focus, the BusyInfo stays on top of the windows 
that below to this other application, although it should be covered by 
those windows.

Here's the relevant code snipped from my application:
-------------------------------------
# Show busy box while tuning:
with wx.WindowDisabler():
      wait = wx.BusyInfo( "Tuning m/z scale...", 
parent=self._app.frame_main )
      while tune.is_running:
            sleep(0.1)
            wx.GetApp().Yield()
      del wait
-------------------------------------

Operating system: Debian Linux / Gnome-3
wxPython version & source: wxPython 4.0 from Debian repositories
Python version & source: Python 3 from Debian repositories

I have already reported this on GitHub, but no feedback so far 
(https://github.com/wxWidgets/Phoenix/issues/1835). Any help or insights 
would be highly welcome!

Thanks
Matthias

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