* Compo node backdrop works again. * Compo node previews and backdrop now get correct color management float to byte conversion. * Compo nodes got unecessarily recalculated while moving nodes. * Fix compo node viewer nodes not getting activated correctly. * Main compo node preview render computations are now outside of mutex lock, so better for multithreading. * Tex node outputs did not work in some files loaded from 2.4. * Change RNA updates to take into account groups that may be shared between multiple node trees.