Reviewed by Hyatt

    Reviewed by Hyatt

        Rewrite of the command that deletes a selection. I deleted great
        big swaths of bug-ridden code to accomplish this and replaced it
        with code that is much cleaner and smarter.

        Also, renamed equivalentUpstreamPosition and equivalentDownstreamPosition to
        upstream to downstream, respectively.

        Added a couple of new helper methods.

        * khtml/editing/htmlediting.cpp: DeleteCollapsibleWhitespaceCommand and
        RemoveNodeAndPruneCommand now obsolete. A huge win.
        * khtml/editing/htmlediting.h: Ditto.
        * khtml/editing/htmlediting_impl.cpp:
        (khtml::debugPosition): Fix printf which had a placeholder, but no argument passed in the varargs.
        (khtml::CompositeEditCommandImpl::deleteUnrenderedText): New helper. Much simplified and cleaner
        version of
        (khtml::ApplyStyleCommandImpl::doApply): upstream/downstream name change
        (khtml::ApplyStyleCommandImpl::nodeFullySelected):  upstream/downstream name change
        (khtml::DeleteSelectionCommandImpl::doApply):  upstream/downstream name change
        (khtml::DeleteTextCommandImpl::DeleteTextCommandImpl): Add an assert to check that the
        passed offset is less than the length of the text node.
        (khtml::InputNewlineCommandImpl::insertNodeAfterPosition): upstream/downstream name change
        (khtml::InputNewlineCommandImpl::insertNodeBeforePosition): upstream/downstream name change
        (khtml::InputNewlineCommandImpl::doApply): upstream/downstream name change
        (khtml::InputTextCommandImpl::prepareForTextInsertion): upstream/downstream name change
        (khtml::InputTextCommandImpl::execute): upstream/downstream name change
        (khtml::InputTextCommandImpl::insertSpace): upstream/downstream name change
        (khtml::ReplaceSelectionCommandImpl::doApply): upstream/downstream name change
        (khtml::TypingCommandImpl::issueCommandForDeleteKey): upstream/downstream name change
        (khtml::TypingCommandImpl::deleteKeyPressed):
        * khtml/editing/htmlediting_impl.h:
        * khtml/xml/dom_position.cpp:
        (DOM::Position::previousWordBoundary):
        (DOM::Position::nextWordBoundary):
        (DOM::Position::upstream):
        (DOM::Position::downstream):
        (DOM::Position::inRenderedText): Add null check.
        (DOM::Position::isRenderedCharacter): New helper.
        (DOM::isWS): New helper in this file.
        (DOM::Position::leadingWhitespacePosition): New helper. Factored out from htmlediting_impl.cpp.
        (DOM::Position::trailingWhitespacePosition): Ditto.
        (DOM::Position::debugPosition): Add null check.
        * khtml/xml/dom_position.h:
        * khtml/xml/dom_selection.cpp:
        (DOM::Selection::toRange): upstream/downstream name change
        (DOM::Selection::validate): upstream/downstream name change
        (DOM::Selection::debugPosition): upstream/downstream name change
        * layout-tests/editing/deleting/delete-block-contents-003-expected.txt: Updated tests with new expected results.
        * layout-tests/editing/deleting/delete-contiguous-ws-001-expected.txt: Ditto.
        * layout-tests/editing/deleting/delete-selection-001-expected.txt: Ditto.
        * layout-tests/editing/deleting/delete-trailing-ws-001-expected.txt: Ditto.
        * layout-tests/editing/inserting/insert-br-case1-expected.txt: Ditto.
        * layout-tests/editing/inserting/insert-br-case2-expected.txt: Ditto.
        * layout-tests/editing/style/style-3681552-fix-002-expected.txt: Ditto.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@7277 268f45cc-cd09-0410-ab3c-d52691b4dbfc