git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@29661 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r29188 from trunk into ruby_1_9_2.¶
Readline.line_buffer should return locale string.
[ruby-dev:42184] #3791
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@29661 b2dd03c8-39d4-4d8f-98ff-823fe69b080e