Pointy line join fix

(cherry picked from commit c1e3b23)

arc-core/src/arc/graphics/g2d/Lines.java

@@ -236,7 +236,8 @@ private static void preparePointyJoin(Vec2 A, Vec2 B, Vec2 C, Vec2 D, Vec2 E, fl
             prepareStraightJoin(B, D, E, halfLineWidth);
             return;
         }
-        float len = (float)(halfLineWidth / Math.sin(angle));
+        //clamps length to avoid super sharp edges. this looks pretty bad, but it's better than the alternative of a 1-pixel line to infinity
+        float len = Mathf.clamp((float)(halfLineWidth / Math.sin(angle)), -halfLineWidth*10f, halfLineWidth*10f);
         boolean bendsLeft = angle < 0;
         AB.setLength(len);
         BC.setLength(len);