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Alexis Girault authored
Bug description : After a text element of vtkCornerAnnotation was set to a non-empty string and had been rendered, then setting the text element to an empty string resulted in incorrect rendering: a rectangle was drawn with the bounds of the previous text element. Fix : In 'vtkTextMapper::RenderOverlay()' the image was not updated if the input text string was empty ( this->Input[0] ). Co-Authored-by: Max Smolens <max.smolens@kitware.com>
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