Draw a single underline for text-decoration-style: [dashed, dotted].

Source/core/rendering/InlineTextBox.cpp

Index: Source/core/rendering/InlineTextBox.cpp
diff --git a/Source/core/rendering/InlineTextBox.cpp b/Source/core/rendering/InlineTextBox.cpp
index ea9d086717a5e08c1a546ab9a6a699d1b9b17741..4563d4bd3e4b823cead47d22d3451821d452ac31 100644
--- a/Source/core/rendering/InlineTextBox.cpp
+++ b/Source/core/rendering/InlineTextBox.cpp
@@ -1102,6 +1102,17 @@ void InlineTextBox::paintDecoration(GraphicsContext* context, const FloatPoint&
 
     context->setStrokeThickness(textDecorationThickness);
 
+    switch (decorationStyle) {
+    case TextDecorationStyleDotted:
+    case TextDecorationStyleDashed:
+        context->setShouldAntialias(RenderBoxModelObject::shouldAntialiasLines(context));
+        break;
+    case TextDecorationStyleSolid:
+    case TextDecorationStyleDouble:
+    case TextDecorationStyleWavy:
+        break;
+    }
+
     float extraOffset = 0;
     if (!linesAreOpaque && shadowCount > 1) {
         FloatRect clipRect(localOrigin, FloatSize(width, baseline + 2));