[gtk/fix-winding] Fix gsk_contour_get_winding

[Matthias Clasen <matthiasc src gnome org>]

commit 7a2d99576e854db67d65678f8821210de8732673
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Dec 13 21:47:17 2020 -0500

    Fix gsk_contour_get_winding
    
    If a contour is not closed, its winding number is
    zero, by definition.

 gsk/gskcontour.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/gsk/gskcontour.c b/gsk/gskcontour.c
index 59de4bb759..33bbc72695 100644
--- a/gsk/gskcontour.c
+++ b/gsk/gskcontour.c
@@ -1651,7 +1651,10 @@ gsk_contour_get_winding (const GskContour       *self,
                          const graphene_point_t *point,
                          gboolean               *on_edge)
 {
-  return self->klass->get_winding (self, measure_data, point, on_edge);
+  if (gsk_contour_get_flags (self) & GSK_PATH_CLOSED)
+    return self->klass->get_winding (self, measure_data, point, on_edge);
+
+  return 0;
 }
 
 void