vtkRenderWindowInteractor, wrong KeySym received by observers
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
vtkRenderWindowInteractor::SetEventInformation() (two overloads) do not call SetKeySym() if the keysym argument is NULL, i.e., they do no clear the keysym. Therefore, when a key event observer calls GetKeySym(), it may continue to get the same(but wrong) keysym from a previous key event.