Bug 781621 - PDB shapeburst gradient is slower than the blend tool.
PDB function gimp_edit_blend() was based on "gimp:shapeburst" operation whereas the rest of GIMP (in particular, the Blend tool) used "gegl:distance-transform" which is much faster. Setting the operation to "manhattan" metric ensures that it still renders the same way as in 2.8 while being a lot faster. There was still a problem regarding as how it renders differently from the Blend tool, but it turns out that the Blend tool is the one rendering differently from how it used to in 2.8. We should discuss adding the "metric" property in the tool options.
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