[ftstroke] Fix unpredictable failures (#54976).

* src/base/ftstroke.c (ft_sroke_border_close): Set the start tags.

ChangeLog

@@ -1,3 +1,9 @@
+2018-11-08  Alexei Podtelezhnikov  <apodtele@gmail.com>
+
+	[ftstroke] Fix unpredictable failures (#54976).
+
+	* src/base/ftstroke.c (ft_sroke_border_close): Set the start tags.
+
 2018-11-07  Ben Wagner  <bungeman@google.com>
 
 	[truetype] Fix VF check from 2018-09-12 (#54973).

src/base/ftstroke.c

@@ -367,6 +367,7 @@
       /* it contains the `adjusted' starting coordinates          */
       border->num_points    = --count;
       border->points[start] = border->points[count];
+      border->tags[start]   = border->tags[count];
 
       if ( reverse )
       {