[vtkusers] vtkXRenderWindowInteractor bug

[Clinton Stimpson]

I'm using VTK 4.2 -- I can get the shift-tab event on Windows but I 
don't get such an event for X11.

On Windows, I get
Interactor->GetKeyCode() == 9, Interactor->GetKeySym() == "Tab"
for a tab.

On X11, I get
Interactor->GetKeyCode() == 9, Interactor->GetKeySym() == "\t"
for a tab.


On Windows, I get
Interactor->GetKeyCode() == 0, Interactor->GetKeySym() == "Tab"
for a shift-tab.

On X11, I get
Interactor->GetKeyCode() == 0, Interactor->GetKeySym() == NULL
for a shift-tab.

That seems inconsistent to me and I need this to work right.

Clint