Fix bug in the OpenGL colormap bugfix
Oops. In !180 (merged) the color has uninitialized alpha, leading to "random" alpha values in non-encore colormaps. (encore happens to write the alpha and therefore work fine)
Oops. In !180 (merged) the color has uninitialized alpha, leading to "random" alpha values in non-encore colormaps. (encore happens to write the alpha and therefore work fine)