Fix preference direction of smart hiding

It should prefer inner corners. Did this angle change sign? Weird.

Contributes to issue CURA-8192.

src/pathOrderOptimizer.cpp

@@ -1,4 +1,4 @@
-//Copyright (c) 2020 Ultimaker B.V.
+//Copyright (c) 2021 Ultimaker B.V.
 //CuraEngine is released under the terms of the AGPLv3 or higher.
 
 #include <map>
@@ -199,15 +199,15 @@ int PathOrderOptimizer::getClosestPointInPolygon(Point prev_point, int poly_idx)
         switch (config.corner_pref)
         {
             case EZSeamCornerPrefType::Z_SEAM_CORNER_PREF_INNER:
-                if (corner_angle > 1)
+                if (corner_angle > 1) //Is an inner corner.
                 {
                     // p1 lies on a concave curve so reduce the distance to favour it
                     // the more concave the curve, the more we reduce the distance
                     dist_score -= (corner_angle - 1) * corner_shift;
                 }
                 break;
             case EZSeamCornerPrefType::Z_SEAM_CORNER_PREF_OUTER:
-                if (corner_angle < 1)
+                if (corner_angle < 1) //Is an outer corner.
                 {
                     // p1 lies on a convex curve so reduce the distance to favour it
                     // the more convex the curve, the more we reduce the distance
@@ -222,7 +222,7 @@ int PathOrderOptimizer::getClosestPointInPolygon(Point prev_point, int poly_idx)
             {
                 //More curve is better score (reduced distance), but slightly in favour of concave curves.
                 float dist_score_corner = fabs(corner_angle - 1) * corner_shift;
-                if (corner_angle < 1)
+                if (corner_angle > 1) //Is an inner corner.
                 {
                     dist_score_corner *= 2;
                 }