diff -r 0347e9bc883e -r 5d2c9d36da9d src/linetypes/conditionaledge.h
--- a/src/linetypes/conditionaledge.h	Sat Mar 03 16:59:03 2018 +0200
+++ b/src/linetypes/conditionaledge.h	Sat Mar 03 17:25:12 2018 +0200
@@ -33,7 +33,6 @@
 	}
 
 	virtual QString asText() const override;
-	virtual void invert() override;
 	int numVertices() const override { return 4; }
 	int numPolygonVertices() const override { return 2; }
 	LDColor defaultColor() const override { return EdgeColor; }