vim-patch:7.4.303  #818

Problem:    When using double-width characters the text displayed on the
            command line is sometimes truncated.
Solution:   Reset the string lenght. (Nobuhiro Takasaki)

https://code.google.com/p/vim/source/detail?r=463ef551e9f62b63ac3f85f1f297b668b14bcd09