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Effect › Blur › Smart Blur had only its Normal mode: the dialog and
blur.smart took Radius, Threshold and Quality and drew the blur.
Smart Blur now takes a `blurMode` param ("normal", "edgeOnly" or
"overlayEdge"; "normal" by default), which its dialog shows as a Mode
menu. Edge Only draws the edges in white on black, and Overlay Edge
draws them in white over the Normal blur. A pixel is on an edge when
one of its four nearest pixels differs from it by more than the
threshold in a channel and its channels, alpha included, add up to at
least that pixel's. The white and the black keep each pixel's
coverage. Normal draws the same pixels as before, and an effect saved
without `blurMode` draws as Normal.
Docs: docs/effects-parity.md, docs/gaps.md, docs/target-app-parity.md.