I tried to reproduce this in Playgrounds and I can't

TEST_P(AiksTest, HexagonExperimentAntialiasLines) {
  float scale = 5.0f;
  float line_width = 10.f;

  auto callback = [&]() -> sk_sp<DisplayList> {
    if (AiksTest::ImGuiBegin("Controls", nullptr,
                             ImGuiWindowFlags_AlwaysAutoResize)) {
      // Use ImGui::SliderFloat for consistency
      ImGui::SliderFloat("Scale", &scale, 0.001f, 5.0f);
      ImGui::SliderFloat("Width", &line_width, 1.0f, 20.0f);

      ImGui::End();
    }
    DisplayListBuilder builder;
    builder.Scale(static_cast<float>(GetContentScale().x),
                  static_cast<float>(GetContentScale().y));

    builder.DrawPaint(DlPaint(DlColor(0xff111111)));  // Background

    {
      DlPaint hex_paint;
      hex_paint.setColor(
          DlColor::kRed());  // Changed color to Red for visibility
      hex_paint.setStrokeWidth(line_width);  // Use the interactive width

      float cx = 512.0f;  // Center X
      float cy = 384.0f;  // Center Y
      float r = 80.0f;    // Radius (distance from center to vertex)

      float r_sin60 = r * std::sqrt(3.0f) / 2.0f;
      float r_cos60 = r / 2.0f;

      DlPoint v0 = DlPoint(cx + r, cy);                  // Right vertex
      DlPoint v1 = DlPoint(cx + r_cos60, cy - r_sin60);  // Top-right vertex
      DlPoint v2 = DlPoint(
          cx - r_cos60,
          cy - r_sin60);  // Top-left vertex (v1-v2 is top horizontal side)
      DlPoint v3 = DlPoint(cx - r, cy);                  // Left vertex
      DlPoint v4 = DlPoint(cx - r_cos60, cy + r_sin60);  // Bottom-left vertex
      DlPoint v5 =
          DlPoint(cx + r_cos60, cy + r_sin60);  // Bottom-right vertex (v4-v5 is
                                                // bottom horizontal side)

      builder.Translate(cx, cy);
      builder.Scale(scale, scale);
      builder.Translate(-cx, -cy);

      builder.DrawLine(v0, v1, hex_paint);
      builder.DrawLine(v1, v2, hex_paint);  // Top side
      builder.DrawLine(v2, v3, hex_paint);
      builder.DrawLine(v3, v4, hex_paint);
      builder.DrawLine(v4, v5, hex_paint);  // Bottom side
      builder.DrawLine(v5, v0, hex_paint);  // Close the hexagon
    }

    return builder.Build();
  };
  ASSERT_TRUE(OpenPlaygroundHere(callback));
}

[impeller] antialias diagonal lines look lighter #166276

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