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Dmitry Kazakov authored
This adds a blend mode that uses a sigmoid blending function to take the greater alpha of either the current layer or the brush. The result of this is that making multiple passes across the same area but with different strokes will not further increase the opacity past the brush setting or stylus pressure. This can help with consistently shading a region across multiple separate strokes without creating spurious or accidental sharp edges due to edge-overlaps with existing brush strokes. The patch was created by Nicholas Guttenberg Differential revision: https://phabricator.kde.org/D666
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