vim-patch:7.4.306

Problem:    getchar(0) does not return Esc.
Solution:   Do not wait for an Esc sequence to be complete.  (Yasuhiro
            Matsumoto)

https://code.google.com/p/vim/source/detail?r=05e1d8afcc5e375bf708ccc9810e2fd1a5a8a3cf