* ext/readline/readline.c (readline_attempted_completion_function):
in Readline module with GNU Readline 6 case, Readline module
resets completion_append_character to " ", after it executes
completion. So, Readline module stores
completion_append_character, and Readline module always sets it
after Readline module executes completion. [ruby-dev:43456]
[Feature #4635]
merge revision(s) 34109:
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@34471 b2dd03c8-39d4-4d8f-98ff-823fe69b080e