EVT_KEY_DOWN is not called for a non-English keyboard layout in Linux

[Jenyay]

Operating system: Ubuntu 18.10
wxPython version & source: wxPython 4.0.4 self-build.
Python version & source: Python 3.6 stock

Description of the problem: EVT_KEY_DOWN is not called for a non-English keyboard layout (Russian layout for example) in Linux for TextCtrl and StyledTextCtrl. The problem is observed in Ubuntu, everything works under Windows.

Code for test:

# -*- coding: utf-8 -*-

import wx
import wx.stc


class MyFrame(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent, -1, "Key test")
        self.SetSize((600, 500))

        self.textCrl = wx.TextCtrl(self, style=wx.TE_MULTILINE)
        self.styledTextCtrl = wx.stc.StyledTextCtrl(self)
        self.logCtrl = wx.TextCtrl(self, style=wx.TE_READONLY | wx.TE_MULTILINE)

        self.textCrl.Bind(wx.EVT_KEY_DOWN, handler=self._onTextCtrlKeyDown)
        self.styledTextCtrl.Bind(wx.EVT_KEY_DOWN, handler=self._onStyledTextCtrlKeyDown)

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.textCrl, 1, wx.EXPAND)
        sizer.Add(self.styledTextCtrl, 1, wx.EXPAND)
        sizer.Add(self.logCtrl, 1, wx.EXPAND)
        self.SetSizer(sizer)

    def _onTextCtrlKeyDown(self, event):
        text = '[TextCtrl] EVT_KEY_DOWN. Key code = {}\n'.format(event.GetKeyCode())
        self.logCtrl.AppendText(text)
        event.Skip()

    def _onStyledTextCtrlKeyDown(self, event):
        text = '[StyledTextCtrl] EVT_KEY_DOWN. Key code = {}\n'.format(event.GetKeyCode())
        self.logCtrl.AppendText(text)
        event.Skip()


if __name__ == '__main__':
    app = wx.App(0)

    frame = MyFrame(None)
    app.SetTopWindow(frame)
    frame.Show()

    app.MainLoop()

Screenshot in Ubuntu (5 characters were entered, 2 events were triggered.):

[swt2c]

I can reproduce in wxWidgets. It has been reported before also:
https://trac.wxwidgets.org/ticket/18054

[swt2c]

Pull request opened with fix:
wxWidgets/wxWidgets#1186

[RobinD42]

Fixed by #1150