Reviewed by Justin.

        <rdar://problem/4746860> Mail crash in WebCore::CSSMutableStyleDeclaration::merge(WebCore::CSSMutableStyleDeclaration*, bool)

        * editing/style/style-boundary-005.html: Added. Matches steps from bug.
        * editing/execCommand/hilitecolor-expected.txt: Updated (no empty Apple style spans).
        * editing/style/remove-underline-across-paragraph-in-bold-expected.txt: Updated (no empty Apple style spans).
        * editing/style/remove-underline-in-bold-expected.txt: Updated (no empty Apple style spans).
        * editing/style/typing-style-003-expected.txt: Updated (no empty Apple style spans).

WebCore:

        Reviewed by Justin.

        <rdar://problem/4746860> Mail crash in WebCore::CSSMutableStyleDeclaration::merge(WebCore::CSSMutableStyleDeclaration*, bool)

        Tests added or changed:
        * editing/style/style-boundary-005.html: Added. Matches steps from bug.
        * editing/execCommand/hilitecolor-expected.txt: Updated (no empty Apple style spans).
        * editing/style/remove-underline-across-paragraph-in-bold-expected.txt: Updated (no empty Apple style spans).
        * editing/style/remove-underline-in-bold-expected.txt: Updated (no empty Apple style spans).
        * editing/style/typing-style-003-expected.txt: Updated (no empty Apple style spans).

        * dom/Text.cpp:
        (WebCore::Text::splitText):
        Comment changes.
        
        * editing/ApplyStyleCommand.cpp:
        (WebCore::isUnstyledStyleSpan):
        Renamed from isEmptyStyleSpan.
        
        (WebCore::ApplyStyleCommand::applyRelativeFontStyleChange):
        Rename emptySpans local to unstyledSpans.
        
        (WebCore::dummySpanAncestorForNode):
        New. To locate Apple style span created when splitting a text node.
        
        (WebCore::ApplyStyleCommand::cleanupUnstyledAppleStyleSpans):
        Renamed from cleanUpEmptyStyleSpans. Algorithm changed to scan children
        of dummy span's parents, rather than traversing up from start and
        end locations. Old algorithm would miss empty spans in the bug case.
        
        (WebCore::ApplyStyleCommand::applyInlineStyle):
        Use dummySpanAncestorForNode() and cleanupUnstyledAppleStyleSpans().
        
        (WebCore::ApplyStyleCommand::removeCSSStyle):
        Renamed isEmptyStyleSpan() to isUnstyledStyleSpan().
        
        (WebCore::ApplyStyleCommand::mergeStartWithPreviousIfIdentical):
        Comment changes.
        
        * editing/ApplyStyleCommand.h:
        Renamed cleanUpEmptyStyleSpans() to cleanupUnstyledAppleStyleSpans().
          
        * editing/ReplaceSelectionCommand.cpp:
        (WebCore::ReplaceSelectionCommand::removeRedundantStyles):
        Allow for Apple style span to be unstyled, because old email may have this in the DOM.
        Use !node->hasChildNodes() instead of !node->firstChild().
        
        * editing/SplitTextNodeCommand.cpp:
        (WebCore::SplitTextNodeCommand::doApply):
        Comment changes.
        
        * rendering/RenderTreeAsText.cpp:
        (WebCore::isEmptyOrUnstyledAppleStyleSpan):
        (WebCore::operator<<):
        Flag empty or unstyled AppleStyleSpa nbecause we never want to leave them in the DOM



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@17036 268f45cc-cd09-0410-ab3c-d52691b4dbfc