LayoutTests:

LayoutTests:

        Reviewed by harrison

        <rdar://problem/4052343&4052343&4426622> Mail hung on paste text

        Bugs exposed:
        * editing/pasteboard/paste-4039777-fix-expected.checksum:
        * editing/pasteboard/paste-4039777-fix-expected.png:
        * editing/pasteboard/paste-4039777-fix-expected.txt:
        * editing/deleting/delete-3857753-fix-expected.txt:
        * editing/pasteboard/styled-element-markup-expected.checksum:
        * editing/pasteboard/styled-element-markup-expected.png:
        * editing/pasteboard/styled-element-markup-expected.txt:
        * editing/execCommand/insertHTML-expected.checksum:
        * editing/execCommand/insertHTML-expected.png:
        * editing/execCommand/insertHTML-expected.txt:
        * editing/execCommand/insertHTML.html:

        Removed some empty style spans, font tags are replaced by style spans
        in a couple of cases:
        * editing/deleting/merge-different-styles-expected.txt:
        * editing/deleting/pruning-after-merge-1-expected.txt:
        * editing/deleting/pruning-after-merge-2-expected.txt:
        * editing/inserting/insert-3786362-fix-expected.txt:
        * editing/pasteboard/block-wrappers-necessary-expected.txt:
        * editing/pasteboard/display-block-on-spans-expected.txt:
        * editing/pasteboard/merge-end-table-expected.txt:
        * editing/pasteboard/paste-4035648-fix-expected.txt:
        * editing/pasteboard/paste-line-endings-001-expected.txt:
        * editing/pasteboard/paste-line-endings-006-expected.txt:
        * editing/pasteboard/paste-list-001-expected.txt:
        * editing/pasteboard/paste-pre-001-expected.txt:
        * editing/pasteboard/paste-pre-002-expected.txt:
        * editing/pasteboard/paste-table-001-expected.txt:
        * editing/pasteboard/paste-table-002-expected.txt:
        * editing/pasteboard/paste-text-001-expected.txt:
        * editing/pasteboard/paste-text-002-expected.txt:
        * editing/pasteboard/paste-text-003-expected.txt:
        * editing/pasteboard/paste-text-004-expected.txt:
        * editing/pasteboard/paste-text-005-expected.txt:
        * editing/pasteboard/paste-text-006-expected.txt:
        * editing/pasteboard/paste-text-011-expected.txt:
        * editing/pasteboard/paste-text-012-expected.txt:
        * editing/pasteboard/paste-text-013-expected.txt:
        * editing/pasteboard/paste-text-014-expected.txt:
        * editing/pasteboard/paste-text-015-expected.txt:
        * editing/pasteboard/paste-text-016-expected.txt:
        * editing/pasteboard/paste-text-017-expected.txt:
        * editing/pasteboard/paste-text-at-tabspan-001-expected.txt:
        * editing/pasteboard/paste-text-at-tabspan-002-expected.txt:
        * editing/pasteboard/paste-text-at-tabspan-003-expected.txt:
        * editing/pasteboard/styled-element-markup.html:
        * editing/pasteboard/testcase-9507-expected.txt:
        * editing/style/smoosh-styles-001-expected.txt:
        * editing/style/smoosh-styles-002-expected.txt:

WebCore:

        Reviewed by harrison

        <rdar://problem/4052343&4052343&4426622> Mail hung on paste text

        * editing/ReplaceSelectionCommand.cpp:
        (WebCore::isInterchangeNewlineNode):
        (WebCore::isInterchangeConvertedSpaceSpan):
        (WebCore::ReplacementFragment::ReplacementFragment):
        (WebCore::ReplaceSelectionCommand::removeRedundantStyles): Compute the redundant inheritable styles and
        remove them and remove style nodes and style spans which were only contributing redundant styles.
        (WebCore::ReplaceSelectionCommand::doApply):
        * editing/ReplaceSelectionCommand.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15975 268f45cc-cd09-0410-ab3c-d52691b4dbfc