Select › Color Range: sampled colours, Fuzziness, Invert, a live preview and the panel (13.3b)

src/Document/ColorRangeSelection+Session.h

@@ -0,0 +1,15 @@
+    // Select › Color Range's panel; its selection shows until OK.
+    const std::optional<ColorRangeEdit> &colorRange() const { return m_colorRange; }
+    bool canSelectColorRange() const;
+    void beginColorRange();
+    // A canvas click: Shift adds, Alt takes away.
+    void sampleColorRange(QPointF point, bool shift, bool option);
+    // Matches off the UI thread; a newer change supersedes it.
+    void updateColorRange();
+    void commitColorRange();
+    void cancelColorRange();
+    // The sheet's and the canvas's writes, Swift's edit fields.
+    void setColorRangeSampleMode(HueSampleMode mode);
+    void setColorRangeHeld(std::optional<HueSampleMode> held);
+    void setColorRangeFuzziness(double fuzziness);
+    void setColorRangeInvert(bool invert);