Reviewed by Harrison.

    Reviewed by Harrison.

        - fixed <rdar://problem/3980066> Double-click on single character moves insertion point to previous line

        * khtml/khtml_part.cpp:
        (KHTMLPart::selectClosestWordFromMouseEvent): Set affinity too.
        (KHTMLPart::handleMousePressEventTripleClick): Ditto.
        (KHTMLPart::handleMouseMoveEventSelection): Ditto.
        (KHTMLPart::khtmlMouseReleaseEvent): Ditto.

        * khtml/editing/selection.cpp:
        (khtml::Selection::modifyExtendingRightForward): Use endOfLine and endOfDocument.
        (khtml::Selection::modifyMovingRightForward): Ditto.
        (khtml::Selection::modifyExtendingLeftBackward): Use startOfLine and startOfDocument.
        (khtml::Selection::modifyMovingLeftBackward): Ditto.
        (khtml::Selection::validate): Rewrote the section that handles double-click. Two main fixes: 1) use isStartOfLine to
        check for another case where we want to select the word to the right, and 2) use isEndOfParagraph, which seems
        to work correctly in cases where isLastVisiblePositionInParagraph is giving the wrong answer. Also changed the line
        code to use startOfLine/endOfLine and the document code to use startOfDocument/endOfDocument.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8483 268f45cc-cd09-0410-ab3c-d52691b4dbfc