Bug 1906727 - Make `HTMLEditor::SplitAncestorStyledInlineElementsAt` check attr value type first r=peterv

Differential Revision: https://phabricator.services.mozilla.com/D215990

dom/base/nsAttrValue.cpp

@@ -1828,10 +1828,10 @@ bool nsAttrValue::ParsePositiveIntValue(const nsAString& aString) {
   return true;
 }
 
-void nsAttrValue::SetColorValue(nscolor aColor, const nsAString& aString) {
+bool nsAttrValue::SetColorValue(nscolor aColor, const nsAString& aString) {
   mozilla::StringBuffer* buf = GetStringBuffer(aString).take();
   if (!buf) {
-    return;
+    return false;
   }
 
   MiscContainer* cont = EnsureEmptyMiscContainer();
@@ -1840,6 +1840,7 @@ void nsAttrValue::SetColorValue(nscolor aColor, const nsAString& aString) {
 
   // Save the literal string we were passed for round-tripping.
   cont->SetStringBitsMainThread(reinterpret_cast<uintptr_t>(buf) | eStringBase);
+  return true;
 }
 
 bool nsAttrValue::ParseColor(const nsAString& aString) {
@@ -1861,17 +1862,14 @@ bool nsAttrValue::ParseColor(const nsAString& aString) {
   if (colorStr.First() == '#') {
     nsDependentString withoutHash(colorStr.get() + 1, colorStr.Length() - 1);
     if (NS_HexToRGBA(withoutHash, nsHexColorType::NoAlpha, &color)) {
-      SetColorValue(color, aString);
-      return true;
+      return SetColorValue(color, aString);
     }
   } else if (colorStr.LowerCaseEqualsLiteral("transparent")) {
-    SetColorValue(NS_RGBA(0, 0, 0, 0), aString);
-    return true;
+    return SetColorValue(NS_RGBA(0, 0, 0, 0), aString);
   } else {
     const NS_ConvertUTF16toUTF8 colorNameU8(colorStr);
     if (Servo_ColorNameToRgb(&colorNameU8, &color)) {
-      SetColorValue(color, aString);
-      return true;
+      return SetColorValue(color, aString);
     }
   }
 
@@ -1882,8 +1880,7 @@ bool nsAttrValue::ParseColor(const nsAString& aString) {
 
   // Use NS_LooseHexToRGB as a fallback if nothing above worked.
   if (NS_LooseHexToRGB(colorStr, &color)) {
-    SetColorValue(color, aString);
-    return true;
+    return SetColorValue(color, aString);
   }
 
   return false;

dom/base/nsAttrValue.h

@@ -515,7 +515,7 @@ class nsAttrValue {
   // aType can be ePercent or eDoubleValue.
   void SetDoubleValueAndType(double aValue, ValueType aType,
                              const nsAString* aStringValue);
-  void SetColorValue(nscolor aColor, const nsAString& aString);
+  bool SetColorValue(nscolor aColor, const nsAString& aString);
   void SetMiscAtomOrString(const nsAString* aValue);
   void ResetMiscAtomOrString();
   void SetSVGType(ValueType aType, const void* aValue,

editor/libeditor/HTMLStyleEditor.cpp

@@ -2218,15 +2218,17 @@ HTMLEditor::SplitAncestorStyledInlineElementsAt(
               element->GetParsedAttr(aStyle.mAttribute);
           if (attrValue) {
             if (aStyle.mAttribute == nsGkAtoms::size) {
-              if (nsContentUtils::ParseLegacyFontSize(
+              if (attrValue->Type() == nsAttrValue::eInteger &&
+                  nsContentUtils::ParseLegacyFontSize(
                       aStyle.AsInlineStyleAndValue().mAttributeValue) ==
-                  attrValue->GetIntegerValue()) {
+                      attrValue->GetIntegerValue()) {
                 continue;
               }
             } else if (aStyle.mAttribute == nsGkAtoms::color) {
               nsAttrValue newValue;
               nscolor oldColor, newColor;
-              if (attrValue->GetColorValue(oldColor) &&
+              if (attrValue->Type() == nsAttrValue::eColor &&
+                  attrValue->GetColorValue(oldColor) &&
                   newValue.ParseColor(
                       aStyle.AsInlineStyleAndValue().mAttributeValue) &&
                   newValue.GetColorValue(newColor) && oldColor == newColor) {