Fixes stroke path geometry that can draw outside of path if the path ends at sharp turn

Author: chunhtai

impeller/entity/geometry/stroke_path_geometry.cc

@@ -308,15 +308,11 @@ StrokePathGeometry::CreateSolidStrokeVertices(
     // Generate contour geometry.
     for (size_t point_i = contour_start_point_i + 1;
          point_i < contour_end_point_i; point_i++) {
-      // Generate line rect.
+      // Generate vertical line to fill the stroke width at point_i - 1
       vtx.position = polyline.points[point_i - 1] + offset;
       vtx_builder.AppendVertex(vtx);
       vtx.position = polyline.points[point_i - 1] - offset;
       vtx_builder.AppendVertex(vtx);
-      vtx.position = polyline.points[point_i] + offset;
-      vtx_builder.AppendVertex(vtx);
-      vtx.position = polyline.points[point_i] - offset;
-      vtx_builder.AppendVertex(vtx);
 
       if (point_i < contour_end_point_i - 1) {
         compute_offset(point_i + 1);