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Prevent AdjustSelection() from adding a MozBR when
the root node is empty so that EditAfterInner()
can add the BogusBR node.
r=jfrancis@netscape.comsr=sfraser@netscape.coma=scc@mozilla.org
git-svn-id: svn://10.0.0.236/trunk@116938 18797224-902f-48f8-a5cc-f745e15eee43