Fix for <http://bugzilla.opendarwin.org/show_bug.cgi?id=6523>
        "Extract data from SelectionController"

        This patch refactors the data portions of SelectionController into its
        own class, "Selection".

        The extracted data are the base/extent/start/end positions and cursor
        affinity. Also a couple cached values generated by validation are kept around
        in the new class.

        This patch does away with all the different affinities
        (start/end/base/extent) that were never implemented properly, since affinity
        only makes sense when the selection is a caret (as per discussion with mjs and
        darin on #webkit).

        No test cases added because this is a refactoring.

        * WebCore.xcodeproj/project.pbxproj:
        * bridge/mac/MacFrame.mm:
        (MacFrame::findString):
        (MacFrame::advanceToNextMisspelling):
        (MacFrame::baseWritingDirectionForSelectionStart):
        (MacFrame::respondToChangedSelection):
        * bridge/mac/WebCoreFrameBridge.mm:
        (-[WebCoreFrameBridge selectionState]):
        (-[WebCoreFrameBridge selectNSRange:]):
        (-[WebCoreFrameBridge selectionAffinity]):
        (-[WebCoreFrameBridge setMarkDOMRange:]):
        (-[WebCoreFrameBridge ensureSelectionVisible]):
        (-[WebCoreFrameBridge rangeOfCharactersAroundCaret]):
        * khtml/editing/Selection.cpp: Added.
        (khtml::Selection::Selection):
        (khtml::Selection::clear):
        (khtml::Selection::toRange):
        (khtml::Selection::validate):
        (khtml::Selection::adjustForEditableContent):
        (khtml::Selection::debugPosition):
        * khtml/editing/Selection.h: Added.
        (khtml::Selection::):
        (khtml::Selection::state):
        (khtml::Selection::setAffinity):
        (khtml::Selection::affinity):
        (khtml::Selection::setBase):
        (khtml::Selection::setExtent):
        (khtml::Selection::setStart):
        (khtml::Selection::setEnd):
        (khtml::Selection::base):
        (khtml::Selection::extent):
        (khtml::Selection::start):
        (khtml::Selection::end):
        (khtml::Selection::isNone):
        (khtml::Selection::isCaret):
        (khtml::Selection::isRange):
        (khtml::Selection::isCaretOrRange):
        (khtml::Selection::isBaseFirst):
        (khtml::operator==):
        (khtml::operator!=):
        * khtml/editing/SelectionController.cpp:
        (khtml::SelectionController::SelectionController):
        (khtml::SelectionController::operator=):
        (khtml::SelectionController::moveTo):
        (khtml::SelectionController::setModifyBias):
        (khtml::SelectionController::modifyExtendingRightForward):
        (khtml::SelectionController::modifyMovingRightForward):
        (khtml::SelectionController::modifyExtendingLeftBackward):
        (khtml::SelectionController::modifyMovingLeftBackward):
        (khtml::SelectionController::modify):
        (khtml::SelectionController::expandUsingGranularity):
        (khtml::SelectionController::xPosForVerticalArrowNavigation):
        (khtml::SelectionController::clear):
        (khtml::SelectionController::setBase):
        (khtml::SelectionController::setExtent):
        (khtml::SelectionController::toString):
        (khtml::SelectionController::getRangeAt):
        (khtml::SelectionController::frame):
        (khtml::SelectionController::collapseToEnd):
        (khtml::SelectionController::collapseToStart):
        (khtml::SelectionController::layout):
        (khtml::SelectionController::caretRect):
        (khtml::SelectionController::needsCaretRepaint):
        (khtml::SelectionController::paintCaret):
        (khtml::SelectionController::debugRenderer):
        (khtml::SelectionController::formatForDebugger):
        (khtml::SelectionController::showTree):
        * khtml/editing/SelectionController.h:
        (khtml::SelectionController::state):
        (khtml::SelectionController::affinity):
        (khtml::SelectionController::base):
        (khtml::SelectionController::extent):
        (khtml::SelectionController::start):
        (khtml::SelectionController::end):
        (khtml::SelectionController::isNone):
        (khtml::SelectionController::isCaret):
        (khtml::SelectionController::isRange):
        (khtml::SelectionController::isCaretOrRange):
        (khtml::SelectionController::toRange):
        (khtml::SelectionController::baseNode):
        (khtml::SelectionController::extentNode):
        (khtml::SelectionController::baseOffset):
        (khtml::SelectionController::extentOffset):
        (khtml::SelectionController::anchorNode):
        (khtml::SelectionController::anchorOffset):
        (khtml::SelectionController::focusNode):
        (khtml::SelectionController::focusOffset):
        (khtml::operator==):
        * khtml/editing/apply_style_command.cpp:
        (khtml::ApplyStyleCommand::updateStartEnd):
        * khtml/editing/break_blockquote_command.cpp:
        (khtml::BreakBlockquoteCommand::doApply):
        * khtml/editing/delete_selection_command.cpp:
        (khtml::DeleteSelectionCommand::initializePositionData):
        (khtml::DeleteSelectionCommand::handleGeneralDelete):
        (khtml::DeleteSelectionCommand::doApply):
        * khtml/editing/insert_line_break_command.cpp:
        (khtml::InsertLineBreakCommand::doApply):
        * khtml/editing/insert_paragraph_separator_command.cpp:
        (khtml::InsertParagraphSeparatorCommand::doApply):
        * khtml/editing/insert_text_command.cpp:
        (khtml::InsertTextCommand::input):
        * khtml/editing/move_selection_command.cpp:
        (khtml::MoveSelectionCommand::doApply):
        * khtml/editing/replace_selection_command.cpp:
        (khtml::ReplaceSelectionCommand::doApply):
        (khtml::ReplaceSelectionCommand::completeHTMLReplacement):
        * khtml/editing/typing_command.cpp:
        (khtml::TypingCommand::deleteKeyPressed):
        (khtml::TypingCommand::forwardDeleteKeyPressed):
        (khtml::TypingCommand::markMisspellingsAfterTyping):
        * khtml/xml/DocumentImpl.cpp:
        (DocumentImpl::updateSelection):
        * kwq/KWQAccObject.mm:
        (-[KWQAccObject accessibilityAttributeValue:]):
        (-[KWQAccObject doAXTextMarkerRangeForLine:]):
        * kwq/KWQRenderTreeDebug.cpp:
        (writeSelection):
        * page/Frame.cpp:
        (Frame::selectContentsOfNode):
        (Frame::shouldChangeSelection):
        (Frame::computeAndSetTypingStyle):
        (Frame::applyStyle):
        (Frame::applyParagraphStyle):
        (Frame::selectFrameElementInParentIfFullySelected):
        (Frame::revealSelection):
        (Frame::centerSelectionInVisibleArea):
        (Frame::styleForSelectionStart):
        
        * <a few other files, including editing ones>: Added includes since Selection.h and
        SelectionController.h now include fewer things.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12118 268f45cc-cd09-0410-ab3c-d52691b4dbfc