TypeError in wxVTKRenderWindowInteractor

Description

When pressing a key corresponding to unicode code 128-255 [1], the wxVTKRenderWindowInteractor raises the following error:

Traceback (most recent call last):
  File "<venv>\python\lib\site-packages\vtk\wx\wxVTKRenderWindowInteractor.py", line 593, in OnKeyUp
    self._Iren.SetEventInformationFlipY(event.GetX(), event.GetY(),
TypeError: SetEventInformationFlipY argument 5: a string of length 1 is required

[1] For example Umlaut characters ä,ö,ü

Possible cause & resolution

I believe this is because, when converted to utf-8 via

key = 'ä' # offending key example
key.encode('utf-8') 

the resulting byte string has length 2, not 1.

One possible resolution would be changing 256 to 128 in https://gitlab.kitware.com/vtk/vtk/-/blob/657c719a343fa25f73e7d31addb7db316bb5f9d7/Wrapping/Python/vtkmodules/wx/wxVTKRenderWindowInteractor.py#L563 and similar occurrences.

Other information

Platform found on:

• OS: Windows
• wxPython version: 4.2.0