Background color applied on a selection of text is lost when the selection is deleted

Source/core/editing/DeleteSelectionCommand.cpp

Index: Source/core/editing/DeleteSelectionCommand.cpp
diff --git a/Source/core/editing/DeleteSelectionCommand.cpp b/Source/core/editing/DeleteSelectionCommand.cpp
index 6bc3a1b87ad254ef1717b1fcff97d88aa16046d5..0c91ad03a522e5db797c31d27f6ec0abf5fa115f 100644
--- a/Source/core/editing/DeleteSelectionCommand.cpp
+++ b/Source/core/editing/DeleteSelectionCommand.cpp
@@ -292,7 +292,7 @@ void DeleteSelectionCommand::saveTypingStyleState()
         return;
 
     // Figure out the typing style in effect before the delete is done.
-    m_typingStyle = EditingStyle::create(m_selectionToDelete.start());
+    m_typingStyle = EditingStyle::create(m_selectionToDelete.start(), EditingStyle::EditingPropertiesInEffect);

[yosin_UTC9, 2013/09/09 04:57:48]

How about changing default value of EditingStyle::create() to
EditingPropertiesInEffect? 

It seems following functions also need to pass EditingPropertiesInEffect:
- CompositeEditCommand::moveParagraphs(),
- ReplaceSelectionCommand::removeRedundantStylesAndKeepStyleSpanInline
- ReplaceSelectionCommand::handleStyleSpansBeforeInsertion
- ReplaceSelectionCommand::handleStyleSpans
- InsertParagraphSeparatorCommand::calculateStyleBeforeInsertion

If all of them using EditingPropertiesInEffect, 
do we need to have OnlyEditingInheritableProperties?

     m_typingStyle->removeStyleAddedByNode(enclosingAnchorElement(m_selectionToDelete.start()));
 
     // If we're deleting into a Mail blockquote, save the style at end() instead of start()