app: add crop_input parameter to gimp_gegl_apply_operation()
Add a crop_input parameter to gimp_gegl_apply_[cached_]operation(). When TRUE, the functions crop the op's input to the destination rect. This is particularly useful for functions that process the entire input in one go (by means of get_cached_region()). See the next commit. Pass crop_input = FALSE at all call sites for now, to keep the current behavior.
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