wxAssertionError on multiline wx.TextCtrl.Copy() in 4.0.4

Hello,

When I invoke .Copy() on a wx.TextCtrl created with style=wx.TE_MULTILINE, 
a get the following error:

wx._core.wxAssertionError: C++ assertion "IsSingleLine()" failed at 
.../wxPython-4.0.4/ext/wxWidgets/src/gtk/textctrl.cpp(853) in 
GetEditable(): shouldn't be called for multiline

This happens in wxPython 4.0.4 on Linux with GTK+ 3.  It didn't happen with 
wxPython 4.0.3.  I also tried to reproduce it with pure wxWidgets in C++ 
and it didn't happen in wxWidgets 3.0.4.

I am attaching a minimal Python code reproducing the problem and also an 
analogous minimal C++ code demonstrating the non-problem in pure wxWidgets.

Am I doing anything wrong?

Best regards

Tomas Cerha

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#!/usr/bin/env python

import wx


class MyApp(wx.App):
    def OnInit(self):
        frame = wx.Frame(None, title="Test")

        field = wx.TextCtrl(frame, -1, 'abc', style=wx.TE_MULTILINE)
        field.SetSelection(0, 2)
        field.Copy()

        frame.Show()
        return True


if __name__ == '__main__':
    app = MyApp(redirect=False)
    app.MainLoop()

#include <wx/wx.h>

class MyApp: public wxApp
{
public:
   virtual bool OnInit();
};

bool MyApp::OnInit() {
   wxFrame *frame = new wxFrame(NULL, wxID_ANY, "Test", wxPoint(50, 50), wxSize(260, 140));

   wxTextCtrl *field = new wxTextCtrl(frame, wxID_ANY, wxVERSION_STRING, wxPoint(-1, -1),
                                      wxSize(250, 100), wxTE_MULTILINE);
   field->SetSelection(0, 2);
   field->Copy();

   frame->Show(true);
   return true;
}

IMPLEMENT_APP(MyApp);