Reviewed by Darin, Maciej.

    Reviewed by Darin, Maciej.

        <rdar://problem/4075576> Deleting text in new message borks content

        Fixed by removing the methods that attempted to preserve the position.  The idea
        of preserving position is a very recent one, and turned out to not actually address
        the problem it was intended to fix (see below).  Further, is unclear how the position
        could be preserved in a form that could be properly used later on.   Therefore,
        removing the code to work like before is the preferred alternative for this software
        update.  I've written <rdar://problem/4099839> to cover the bug that position
        preservation was supposed to fix (but did not).  Added layout tests for
        both this bug and 4099839.  Also, updated existing tests with correct expected results
        (delete-at-paragraph-boundaries-003 and 004).

        * khtml/editing/htmlediting.cpp:
        (khtml::CompositeEditCommand::removeFullySelectedNode):
        (khtml::CompositeEditCommand::removeChildrenInRange):
        (khtml::DeleteSelectionCommand::handleGeneralDelete):
        * khtml/editing/htmlediting.h:
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-003-expected.txt:
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-004-expected.txt:
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-007-expected.txt: Added.
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-007.html: Added.
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-008-expected.txt: Added.
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-008.html: Added.
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-009-expected.txt: Added.
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-009.html: Added.
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-010-expected.txt: Added.
        * layout-tests/editing/deleting/delete-at-paragraph-boundaries-010.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9054 268f45cc-cd09-0410-ab3c-d52691b4dbfc