[ruby-cvs:78468] a92560132b (master): Support incremental search by last determined word

aycabta	2019-12-03 01:17:07 +0900 (Tue, 03 Dec 2019)

  New Revision: a92560132b

  https://github.com/ruby/ruby/commit/a92560132b

  Log:
    Support incremental search by last determined word
    
    In the incremental search by C-r, search word is saved when it's determined. In
    the next incremental search by C-r, if a user presses C-r again with the empty
    search word, the determined previous search word is used to search.

  Modified files:
    lib/reline.rb
    lib/reline/line_editor.rb
    test/reline/test_key_actor_emacs.rb