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 378f153f7177e20a331a7a1ea8c65694bc6091ac..370bcfddb4a0d41faa9e37c0e2caff2c36557883 100644
--- a/Source/core/rendering/InlineTextBox.cpp
+++ b/Source/core/rendering/InlineTextBox.cpp
@@ -1092,6 +1092,15 @@ void InlineTextBox::paintDecoration(GraphicsContext* context, const FloatPoint&
 
     context->setStrokeThickness(textDecorationThickness);
 
+    switch (decorationStyle) {
+    case TextDecorationStyleSolid:
+    case TextDecorationStyleDouble:
+    case TextDecorationStyleDotted:
+    case TextDecorationStyleDashed:
+        context->setShouldAntialias(RenderBoxModelObject::shouldAntialiasLines(context));
+        break;
+    }
+
     float extraOffset = 0;
     if (!linesAreOpaque && shadowCount > 1) {
         FloatRect clipRect(localOrigin, FloatSize(width, baseline + 2));