[vtk-developers] Fix bug color into vtkInteractorStyle::HighlightActor2D()

[pierre haritchabalet]

Hello,

I found a bug into vtkInteractorStyle::HighlightActor2D(vtkActor2D
*actor2D). In fact, the variable this->PickColor is updated just once when
this->PickedActor2D equals NULL. So if you highlight several cells
successively, PickColor isn't updated. The cells don't go back to the right
color when they are deselected.

I join a patch to modify vtkInteractorStyle::HighlightActor2D(vtkActor2D
*actor2D) to fix the problem.

Pierre Haritchabalet
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