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This should solve the problem when client remove some part of the code, so removes also error markers for it, and then quickly restores it, so for the server it looks as an empty/no-op change. But information is lost, and the server should resend it to the client. R=brianwilkerson@google.com BUG= Review URL: https://codereview.chromium.org//899753004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43521 260f80e4-7a28-3924-810f-c04153c831b5