- HistogramLUTItem avoids using lookup table if possible
- GradientEditorItem has a method to ask whether the gradient is trivial (can be applied without the use of a lookup table)
- ROI, LinearRegionItem, InfiniteLine no longer redraw for every mouse movement
- Corrected ImageItem.setRect transformation order
- PlotCurveItem uses nkPen for interpreting shadowPen arguments
- PlotItem and PlotWidget wrap a few more missing methods from ViewBox