Fixed: <rdar://problem/3951196> REGRESSION (Mail): too many levels of reply quotes...

	Fixed: <rdar://problem/3951196> REGRESSION (Mail): too many levels of reply quotes after certain steps

        Reviewed by kocienda.

        * khtml/editing/htmlediting.cpp:
        (khtml::InsertParagraphSeparatorInQuotedContentCommand::doApply):
	- If we find a new start node, update topBlockquote so we don't use too many block quotes for the contents following the new line.
	- Build up the list of ancestors after we've determined the actual topBlockquote.
	- Don't insert an extra new line if there is a new start node.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8638 268f45cc-cd09-0410-ab3c-d52691b4dbfc