Reviewed by justin

        <rdar://problem/4622763> Deleting from beginning of paragraph following a table deletes rather than selects the table

        * editing/deleting/delete-block-table-expected.checksum: Added.
        * editing/deleting/delete-block-table-expected.png: Added.
        * editing/deleting/delete-block-table-expected.txt: Added.
        * editing/deleting/delete-block-table.html: Added.
        * editing/deleting/delete-hr-expected.checksum: Added.
        * editing/deleting/delete-hr-expected.png: Added.
        * editing/deleting/delete-hr-expected.txt: Added.
        * editing/deleting/delete-hr.html: Added.
        * editing/deleting/delete-to-select-table-expected.png:
        * editing/execCommand/insertHorizontalRule-expected.txt:
        * fast/lists/markers-in-selection-expected.txt:

WebCore:

        Reviewed by justin

        <rdar://problem/4622763> Deleting from beginning of paragraph following a table deletes rather than selects the table

        * editing/DeleteSelectionCommand.cpp:
        (WebCore::DeleteSelectionCommand::initializeStartEnd): Added selection expansion for HRs.
        (WebCore::DeleteSelectionCommand::initializePositionData): Now uses enclosingBlockFlowOrTableElement
        instead of enclosingBlockFlowElement.
        (WebCore::DeleteSelectionCommand::removeNode): Use to identify that we need a placeholder
        when the start or end block is removed.
        (WebCore::DeleteSelectionCommand::handleGeneralDelete): Added check for canHaveChildrenForEditing
        to keep things like HRs from being given children.
        (WebCore::DeleteSelectionCommand::doApply): Switched to use member variable for needPlaceholder.
        * editing/DeleteSelectionCommand.h: Made needPlaceholder a member variable.
        * editing/TypingCommand.cpp:
        (WebCore::TypingCommand::deleteKeyPressed): Fixed selection bug for tables and open typing commands.
        (WebCore::TypingCommand::forwardDeleteKeyPressed): Ditto.
        * editing/htmlediting.cpp:
        (WebCore::editingIgnoresContent): Added check for HRs, since it's not considered a widget.
        * editing/visible_units.cpp:
        (WebCore::startOfParagraph): Fix for HRs and tables.
        (WebCore::endOfParagraph): Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15408 268f45cc-cd09-0410-ab3c-d52691b4dbfc