Re-land "[css3-text] Implement text-decoration property shorthand"

Source/core/editing/EditingStyle.cpp

Index: Source/core/editing/EditingStyle.cpp
diff --git a/Source/core/editing/EditingStyle.cpp b/Source/core/editing/EditingStyle.cpp
index 6e34dc978950576d277db9c8fc51457cfa61d900..c568fccccf27a2454ef615c5d930d6bfa8181e53 100644
--- a/Source/core/editing/EditingStyle.cpp
+++ b/Source/core/editing/EditingStyle.cpp
@@ -56,6 +56,12 @@
 
 namespace WebCore {
 
+static const CSSPropertyID& textDecorationPropertyForEditing()
+{
+    static const CSSPropertyID property = RuntimeEnabledFeatures::css3TextDecorationsEnabled() ? CSSPropertyTextDecorationLine : CSSPropertyTextDecoration;
+    return property;
+}
+
 // Editing style properties must be preserved during editing operation.
 // e.g. when a user inserts a new paragraph, all properties listed here must be copied to the new paragraph.
 // NOTE: Use either allEditingProperties() or inheritableEditingProperties() to
@@ -72,7 +78,10 @@ static const CSSPropertyID staticEditingProperties[] = {
     CSSPropertyLineHeight,
     CSSPropertyOrphans,
     CSSPropertyTextAlign,
+    // FIXME: CSSPropertyTextDecoration needs to be removed when CSS3 Text
+    // Decoration feature is no longer experimental.
     CSSPropertyTextDecoration,
+    CSSPropertyTextDecorationLine,
     CSSPropertyTextIndent,
     CSSPropertyTextTransform,
     CSSPropertyWhiteSpace,
@@ -89,8 +98,11 @@ enum EditingPropertiesType { OnlyInheritableEditingProperties, AllEditingPropert
 static const Vector<CSSPropertyID>& allEditingProperties()
 {
     DEFINE_STATIC_LOCAL(Vector<CSSPropertyID>, properties, ());
-    if (properties.isEmpty())
+    if (properties.isEmpty()) {
         RuntimeCSSEnabled::filterEnabledCSSPropertiesIntoVector(staticEditingProperties, WTF_ARRAY_LENGTH(staticEditingProperties), properties);
+        if (RuntimeEnabledFeatures::css3TextDecorationsEnabled())
+            properties.remove(properties.find(CSSPropertyTextDecoration));
+    }
     return properties;
 }
 
@@ -207,21 +219,22 @@ private:
 };
 
 HTMLTextDecorationEquivalent::HTMLTextDecorationEquivalent(CSSValueID primitiveValue, const QualifiedName& tagName)
-    : HTMLElementEquivalent(CSSPropertyTextDecoration, primitiveValue, tagName)
+    : HTMLElementEquivalent(textDecorationPropertyForEditing(), primitiveValue, tagName)
     // m_propertyID is used in HTMLElementEquivalent::addToStyle
 {
 }
 
 bool HTMLTextDecorationEquivalent::propertyExistsInStyle(const StylePropertySet* style) const
 {
-    return style->getPropertyCSSValue(CSSPropertyWebkitTextDecorationsInEffect) || style->getPropertyCSSValue(CSSPropertyTextDecoration);
+    return style->getPropertyCSSValue(CSSPropertyWebkitTextDecorationsInEffect)
+        || style->getPropertyCSSValue(textDecorationPropertyForEditing());
 }
 
 bool HTMLTextDecorationEquivalent::valueIsPresentInStyle(Element* element, StylePropertySet* style) const
 {
     RefPtr<CSSValue> styleValue = style->getPropertyCSSValue(CSSPropertyWebkitTextDecorationsInEffect);
     if (!styleValue)
-        styleValue = style->getPropertyCSSValue(CSSPropertyTextDecoration);
+        styleValue = style->getPropertyCSSValue(textDecorationPropertyForEditing());
     return matches(element) && styleValue && styleValue->isValueList() && toCSSValueList(styleValue.get())->hasValue(m_primitiveValue.get());
 }
 
@@ -649,15 +662,18 @@ void EditingStyle::collapseTextDecorationProperties()
         return;
 
     if (textDecorationsInEffect->isValueList())
-        m_mutableStyle->setProperty(CSSPropertyTextDecoration, textDecorationsInEffect->cssText(), m_mutableStyle->propertyIsImportant(CSSPropertyTextDecoration));
+        m_mutableStyle->setProperty(textDecorationPropertyForEditing(), textDecorationsInEffect->cssText(), m_mutableStyle->propertyIsImportant(textDecorationPropertyForEditing()));
     else
-        m_mutableStyle->removeProperty(CSSPropertyTextDecoration);
+        m_mutableStyle->removeProperty(textDecorationPropertyForEditing());
     m_mutableStyle->removeProperty(CSSPropertyWebkitTextDecorationsInEffect);
 }
 
 // CSS properties that create a visual difference only when applied to text.
 static const CSSPropertyID textOnlyProperties[] = {
+    // FIXME: CSSPropertyTextDecoration needs to be removed when CSS3 Text
+    // Decoration feature is no longer experimental.
     CSSPropertyTextDecoration,
+    CSSPropertyTextDecorationLine,
     CSSPropertyWebkitTextDecorationsInEffect,
     CSSPropertyFontStyle,
     CSSPropertyFontWeight,
@@ -734,12 +750,16 @@ bool EditingStyle::conflictsWithInlineStyleOfElement(Element* element, EditingSt
         if (propertyID == CSSPropertyWhiteSpace && isTabSpanNode(element))
             continue;
 
-        if (propertyID == CSSPropertyWebkitTextDecorationsInEffect && inlineStyle->getPropertyCSSValue(CSSPropertyTextDecoration)) {
+        if (propertyID == CSSPropertyWebkitTextDecorationsInEffect && inlineStyle->getPropertyCSSValue(textDecorationPropertyForEditing())) {
             if (!conflictingProperties)
                 return true;
             conflictingProperties->append(CSSPropertyTextDecoration);
+            // Because text-decoration expands to text-decoration-line when CSS3
+            // Text Decoration is enabled, we also state it as conflicting.
+            if (RuntimeEnabledFeatures::css3TextDecorationsEnabled())
+                conflictingProperties->append(CSSPropertyTextDecorationLine);
             if (extractedStyle)
-                extractedStyle->setProperty(CSSPropertyTextDecoration, inlineStyle->getPropertyValue(CSSPropertyTextDecoration), inlineStyle->propertyIsImportant(CSSPropertyTextDecoration));
+                extractedStyle->setProperty(textDecorationPropertyForEditing(), inlineStyle->getPropertyValue(textDecorationPropertyForEditing()), inlineStyle->propertyIsImportant(textDecorationPropertyForEditing()));
             continue;
         }
 
@@ -1097,7 +1117,7 @@ void EditingStyle::mergeStyle(const StylePropertySet* style, CSSPropertyOverride
         RefPtr<CSSValue> value = m_mutableStyle->getPropertyCSSValue(property.id());
 
         // text decorations never override values
-        if ((property.id() == CSSPropertyTextDecoration || property.id() == CSSPropertyWebkitTextDecorationsInEffect) && property.value()->isValueList() && value) {
+        if ((property.id() == textDecorationPropertyForEditing() || property.id() == CSSPropertyWebkitTextDecorationsInEffect) && property.value()->isValueList() && value) {
             if (value->isValueList()) {
                 mergeTextDecorationValues(toCSSValueList(value.get()), toCSSValueList(property.value()));
                 continue;
@@ -1352,18 +1372,18 @@ WritingDirection EditingStyle::textDirectionForSelection(const VisibleSelection&
 static void reconcileTextDecorationProperties(MutableStylePropertySet* style)
 {
     RefPtr<CSSValue> textDecorationsInEffect = style->getPropertyCSSValue(CSSPropertyWebkitTextDecorationsInEffect);
-    RefPtr<CSSValue> textDecoration = style->getPropertyCSSValue(CSSPropertyTextDecoration);
+    RefPtr<CSSValue> textDecoration = style->getPropertyCSSValue(textDecorationPropertyForEditing());
     // We shouldn't have both text-decoration and -webkit-text-decorations-in-effect because that wouldn't make sense.
     ASSERT(!textDecorationsInEffect || !textDecoration);
     if (textDecorationsInEffect) {
-        style->setProperty(CSSPropertyTextDecoration, textDecorationsInEffect->cssText());
+        style->setProperty(textDecorationPropertyForEditing(), textDecorationsInEffect->cssText());
         style->removeProperty(CSSPropertyWebkitTextDecorationsInEffect);
         textDecoration = textDecorationsInEffect;
     }
 
     // If text-decoration is set to "none", remove the property because we don't want to add redundant "text-decoration: none".
     if (textDecoration && !textDecoration->isValueList())
-        style->removeProperty(CSSPropertyTextDecoration);
+        style->removeProperty(textDecorationPropertyForEditing());
 }
 
 StyleChange::StyleChange(EditingStyle* style, const Position& position)
@@ -1427,7 +1447,7 @@ void StyleChange::extractTextStyles(Document* document, MutableStylePropertySet*
 
     // Assuming reconcileTextDecorationProperties has been called, there should not be -webkit-text-decorations-in-effect
     // Furthermore, text-decoration: none has been trimmed so that text-decoration property is always a CSSValueList.
-    RefPtr<CSSValue> textDecoration = style->getPropertyCSSValue(CSSPropertyTextDecoration);
+    RefPtr<CSSValue> textDecoration = style->getPropertyCSSValue(textDecorationPropertyForEditing());
     if (textDecoration && textDecoration->isValueList()) {
         DEFINE_STATIC_LOCAL(RefPtr<CSSPrimitiveValue>, underline, (CSSPrimitiveValue::createIdentifier(CSSValueUnderline)));
         DEFINE_STATIC_LOCAL(RefPtr<CSSPrimitiveValue>, lineThrough, (CSSPrimitiveValue::createIdentifier(CSSValueLineThrough)));
@@ -1439,7 +1459,7 @@ void StyleChange::extractTextStyles(Document* document, MutableStylePropertySet*
             m_applyLineThrough = true;
 
         // If trimTextDecorations, delete underline and line-through
-        setTextDecorationProperty(style, newTextDecoration.get(), CSSPropertyTextDecoration);
+        setTextDecorationProperty(style, newTextDecoration.get(), textDecorationPropertyForEditing());
     }
 
     int verticalAlign = getIdentifierValue(style, CSSPropertyVerticalAlign);
@@ -1537,7 +1557,7 @@ PassRefPtr<MutableStylePropertySet> getPropertiesNotIn(StylePropertySet* styleWi
     result->removeEquivalentProperties(baseStyle);
 
     RefPtr<CSSValue> baseTextDecorationsInEffect = baseStyle->getPropertyCSSValueInternal(CSSPropertyWebkitTextDecorationsInEffect);
-    diffTextDecorations(result.get(), CSSPropertyTextDecoration, baseTextDecorationsInEffect.get());
+    diffTextDecorations(result.get(), textDecorationPropertyForEditing(), baseTextDecorationsInEffect.get());
     diffTextDecorations(result.get(), CSSPropertyWebkitTextDecorationsInEffect, baseTextDecorationsInEffect.get());
 
     if (RefPtr<CSSValue> baseFontWeight = baseStyle->getPropertyCSSValueInternal(CSSPropertyFontWeight)) {