Ruby » Ruby master

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