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David Thompson authored
Now `vtkMathTextActor` inherits from `vtkTextActor` from the `vtkRenderingFreeType` kit. It uses the `vtkTextActor` to render as a fallback when a `vtkMathTextUtilities` instance is not available. Also, the bounding box is computed properly even before a render (by assuming a display resolution in order to decide on a texture image size). Change-Id: I7f9e41f7714cc4e6e0efb42091dc313e0336fa9d
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