12.1: feathered selections, Select Subject, Soft Light, the fixed-width font menu (Compositor 1.1.1–1.1.4)

src/Document/MaskTracing.h

@@ -6,5 +6,7 @@
 // Raster coverage traced into an outline along exact pixel edges.
 namespace MaskTracing {
 std::optional<QPainterPath> darkPixels(const QImage &image);
+// A mask's pixels at least half white: what it shows.
+std::optional<QPainterPath> whitePixels(const QImage &image);
 std::optional<QPainterPath> opaquePixels(const QImage &image);
 }