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Zack Galbreath authored
vtkTreeHeatmapItem now supports a dendrogram for the columns of the heatmap. This provides users with a way to interactively collapse and expand columns. The GetBounds() methods of vtkDendrogram, vtkHeatmapItem, and vtkTreeHeatmapItem now include the size of any displayed text labels. This required some changes to the way that the components of vtkTanglegramItem are laid out. Change-Id: Icdc9342d360b772819ff7863ed2a971e8865003e
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