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Fix noise extent and memory leak in vtkImageDataLIC2D

Karsten Tausche requested to merge karsten.tausche/vtk:fix_imageDataLIC into master

vtkImageDataLIC2D tried to copy 2 float components of its noise texture to the GPU memory, though only one component is generated and used.

Regarding the magnification shader in vtkImageDataLIC2D in the old rendering backend:

  • it was not deleted in the destructor.
  • if the shader did not build successfully: it was not deleted and mistakenly accessed

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