usa d650009151 merge revision(s) 49223: [Backport #10732]
* 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/branches/ruby_2_0_0@49445 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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