Reviewed by Darin.

    Reviewed by Darin.

        <rdar://problem/3937447> Mail-689: Arrow key navigation in new message body stops working when a line ends with a bold word

        Added affinity to VisiblePosition.  Changed Selection code to use affinity more.

        (Partial) <rdar://problem/3982096> editing/pasteboard/paste-text-007 is failing

        Changed ReplaceSelectionCommand to also pay attention to the top children of the incoming fragment, not just the very last node inserted, when deciding whether to insert a paragraph for the Apple interchange newline.

        * khtml/ecma/kjs_window.cpp:
        (SelectionFunc::tryCall):
        * khtml/editing/htmlediting.cpp:
        (khtml::EditCommandPtr::setStartingSelection):
        (khtml::EditCommandPtr::setEndingSelection):
        (khtml::EditCommand::setStartingSelection):
        (khtml::EditCommand::setEndingSelection):
        (khtml::CompositeEditCommand::deleteInsignificantTextDownstream):
        (khtml::CompositeEditCommand::moveParagraphContentsToNewBlockIfNecessary):
        (khtml::ApplyStyleCommand::splitTextAtStartIfNeeded):
        (khtml::ApplyStyleCommand::splitTextAtEndIfNeeded):
        (khtml::ApplyStyleCommand::splitTextElementAtStartIfNeeded):
        (khtml::ApplyStyleCommand::splitTextElementAtEndIfNeeded):
        (khtml::ApplyStyleCommand::mergeStartWithPreviousIfIdentical):
        (khtml::ApplyStyleCommand::mergeEndWithNextIfIdentical):
        (khtml::ApplyStyleCommand::joinChildTextNodes):
        (khtml::DeleteSelectionCommand::initializePositionData):
        (khtml::DeleteSelectionCommand::handleGeneralDelete):
        (khtml::DeleteSelectionCommand::calculateTypingStyleAfterDelete):
        (khtml::DeleteSelectionCommand::doApply):
        (khtml::InsertLineBreakCommand::doApply):
        (khtml::InsertParagraphSeparatorCommand::doApply):
        (khtml::InsertParagraphSeparatorInQuotedContentCommand::doApply):
        (khtml::InsertTextCommand::input):
        (khtml::MoveSelectionCommand::doApply):
        (khtml::ReplaceSelectionCommand::ReplaceSelectionCommand):
        (khtml::ReplaceSelectionCommand::~ReplaceSelectionCommand):
        (khtml::ReplaceSelectionCommand::doApply):
        (khtml::ReplaceSelectionCommand::completeHTMLReplacement):
        (khtml::ReplaceSelectionCommand::updateNodesInserted):
        (khtml::TypingCommand::deleteKeyPressed):
        (khtml::TypingCommand::forwardDeleteKeyPressed):
        (khtml::TypingCommand::markMisspellingsAfterTyping):
        * khtml/editing/htmlediting.h:
        * khtml/editing/selection.cpp:
        (khtml::Selection::Selection):
        (khtml::Selection::init):
        (khtml::Selection::moveTo):
        (khtml::Selection::modifyExtendingRightForward):
        (khtml::Selection::modifyMovingRightForward):
        (khtml::Selection::modifyExtendingLeftBackward):
        (khtml::Selection::modifyMovingLeftBackward):
        (khtml::Selection::modify):
        (khtml::Selection::xPosForVerticalArrowNavigation):
        (khtml::Selection::clear):
        (khtml::Selection::setBase):
        (khtml::Selection::setExtent):
        (khtml::Selection::setBaseAndExtent):
        (khtml::Selection::layout):
        (khtml::Selection::validate):
        * khtml/editing/selection.h:
        (khtml::Selection::startAffinity):
        (khtml::Selection::endAffinity):
        (khtml::Selection::baseAffinity):
        (khtml::Selection::extentAffinity):
        (khtml::operator==):
        * khtml/editing/text_affinity.h:
        (khtml::):
        * khtml/editing/visible_position.cpp:
        (khtml::VisiblePosition::VisiblePosition):
        (khtml::VisiblePosition::init):
        (khtml::VisiblePosition::initUpstream):
        (khtml::VisiblePosition::initDownstream):
        (khtml::VisiblePosition::next):
        (khtml::VisiblePosition::previous):
        (khtml::startVisiblePosition):
        (khtml::endVisiblePosition):
        * khtml/editing/visible_position.h:
        (khtml::VisiblePosition::):
        (khtml::VisiblePosition::VisiblePosition):
        (khtml::VisiblePosition::affinity):
        (khtml::VisiblePosition::setAffinity):
        (khtml::operator==):
        * khtml/editing/visible_units.cpp:
        (khtml::previousBoundary):
        (khtml::nextBoundary):
        (khtml::startOfLine):
        (khtml::endOfLine):
        (khtml::previousLinePosition):
        (khtml::nextLinePosition):
        (khtml::startOfParagraph):
        (khtml::endOfParagraph):
        (khtml::previousParagraphPosition):
        (khtml::nextParagraphPosition):
        (khtml::startOfBlock):
        (khtml::endOfBlock):
        (khtml::startOfDocument):
        (khtml::endOfDocument):
        * khtml/editing/visible_units.h:
        * khtml/khtml_part.cpp:
        (KHTMLPart::findTextNext):
        (KHTMLPart::selectClosestWordFromMouseEvent):
        (KHTMLPart::handleMousePressEventTripleClick):
        (KHTMLPart::handleMousePressEventSingleClick):
        (KHTMLPart::handleMouseMoveEventSelection):
        (KHTMLPart::khtmlMouseReleaseEvent):
        (KHTMLPart::selectAll):
        (KHTMLPart::computeAndSetTypingStyle):
        (KHTMLPart::selectionComputedStyle):
        * khtml/rendering/render_br.cpp:
        (RenderBR::positionForCoordinates):
        * khtml/xml/dom_docimpl.cpp:
        (DocumentImpl::updateSelection):
        * khtml/xml/dom_nodeimpl.cpp:
        (NodeBaseImpl::setFocus):
        * khtml/xml/dom_position.cpp:
        (DOM::Position::previousCharacterPosition):
        (DOM::Position::nextCharacterPosition):
        * khtml/xml/dom_position.h:
        * kwq/KWQAccObject.mm:
        (-[KWQAccObject value]):
        (-[KWQAccObject visiblePositionForStartOfTextMarkerRange:]):
        (-[KWQAccObject visiblePositionForEndOfTextMarkerRange:]):
        (-[KWQAccObject accessibilityAttributeValue:]):
        (-[KWQAccObject doAXLineForTextMarker:]):
        (-[KWQAccObject doAXTextMarkerRangeForLine:]):
        (-[KWQAccObject doAXTextMarkerForPosition:]):
        (-[KWQAccObject doAXLeftLineTextMarkerRangeForTextMarker:]):
        (-[KWQAccObject doAXRightLineTextMarkerRangeForTextMarker:]):
        (-[KWQAccObject doAXNextWordEndTextMarkerForTextMarker:]):
        (-[KWQAccObject doAXPreviousWordStartTextMarkerForTextMarker:]):
        (-[KWQAccObject doAXNextLineEndTextMarkerForTextMarker:]):
        (-[KWQAccObject doAXPreviousLineStartTextMarkerForTextMarker:]):
        (-[KWQAccObject doSetAXSelectedTextMarkerRange:]):
        * kwq/KWQAccObjectCache.mm:
        (KWQAccObjectCache::textMarkerForVisiblePosition):
        (KWQAccObjectCache::visiblePositionForTextMarker):
        * kwq/KWQKHTMLPart.mm:
        (KWQKHTMLPart::findString):
        (KWQKHTMLPart::advanceToNextMisspelling):
        (KWQKHTMLPart::styleForSelectionStart):
        (KWQKHTMLPart::baseWritingDirectionForSelectionStart):
        (KWQKHTMLPart::setSelectionFromNone):
        (KWQKHTMLPart::respondToChangedSelection):
        * kwq/WebCoreBridge.mm:
        (-[WebCoreBridge setSelectedDOMRange:affinity:]):
        (-[WebCoreBridge selectionAffinity]):
        (-[WebCoreBridge setMarkDOMRange:]):
        (-[WebCoreBridge _visiblePositionForPoint:]):
        (-[WebCoreBridge moveDragCaretToPoint:]):
        (-[WebCoreBridge editableDOMRangeForPoint:]):
        (-[WebCoreBridge ensureSelectionVisible]):
        (-[WebCoreBridge rangeOfCharactersAroundCaret]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8554 268f45cc-cd09-0410-ab3c-d52691b4dbfc