Fixed several small (stupid) issues with the inpaint node: * on pixel order building, some ranges got wrong and origin was considered several times. * the convolution kernel didn't consider all pixels (+1,0),(-1,0),(0,1) and (0-1) were omited, leading to suboptimal results (sometimes even black areas) * alpha channel is now only affected an areas considered by inpaint. That's only important, if you choose low iteration counts.