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Ell authored
In GimpOperationLayerMode, when the op has a mask connected, and we're processing an area outside the mask bounds, set the op's opacity to 0, so that the backdrop shows through. The actual process() function gets a NULL mask pointer in this case, and so would composite the layer as if it had no mask, exposing areas that should be masked out. Add a GimpOperationLayerMode::parent_process() function, which subclasses can override instead of GeglOperation::process(), and make sure to update the GimpOperationLayerMode::opacity field before calling this function (and, subsequently, before calling GimpOperationLayerMode::process()). Clean up the rest of the fields, and adjust the rest of the code. (cherry picked from commit 646c804c)
3c702fbc