Danny Robson authored Jan 18, 2010 and Øyvind "pippin" Kolås committed Jan 18, 2010

When prepare is called, we have been relinking the
input/composite/output nodes dependent on whether there is an input.
This causes massive cache invalidations on every call to prepare,
halting forward progress of gegl_processor_render. Cache the previous
parameters and only relink the nodes if there has been a change.