From 59c137a99b4473efe3231af5adcce8988905bd79 Mon Sep 17 00:00:00 2001
From: Yuri Roubinsky <chaosus89@gmail.com>
Date: Tue, 10 Aug 2021 09:08:02 +0300
Subject: Fix incorrect border width of antialiased lines

---
 servers/rendering/renderer_canvas_cull.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/servers/rendering/renderer_canvas_cull.cpp b/servers/rendering/renderer_canvas_cull.cpp
index ec0a8347f8..fd7d5b91fa 100644
--- a/servers/rendering/renderer_canvas_cull.cpp
+++ b/servers/rendering/renderer_canvas_cull.cpp
@@ -639,17 +639,19 @@ void RendererCanvasCull::canvas_item_add_polyline(RID p_item, const Vector<Point
 
 			j2 = j + 1;
 
-			Vector2 tangent = ((t + prev_t).normalized()) * p_width * 0.5;
+			Vector2 dir = (t + prev_t).normalized();
+			Vector2 tangent = dir * p_width * 0.5;
+			Vector2 border = dir * 2.0;
 			Vector2 pos = p_points[i];
 
 			points_ptr[j] = pos + tangent;
 			points_ptr[j2] = pos - tangent;
 
-			points_top_ptr[j] = pos + tangent + tangent;
+			points_top_ptr[j] = pos + tangent + border;
 			points_top_ptr[j2] = pos + tangent;
 
 			points_bottom_ptr[j] = pos - tangent;
-			points_bottom_ptr[j2] = pos - tangent - tangent;
+			points_bottom_ptr[j2] = pos - tangent - border;
 
 			if (i < p_colors.size()) {
 				color = p_colors[i];
-- 
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