nobu 77f3125567 rdoc/text.rb: fix infinite loop
* lib/rdoc/text.rb (expand_tabs): get rid of infinite loop with
  CR.  should check if substitution occurred too.
  [ruby-dev:48813] [Bug #10732]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49223 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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