cursor on chinese characters is not the same width with the character， only a half of it

[daizhan]

my env:

• vimStyle 0.3.12
• vscode 1.3.1
• system window 10

maybe other multibyte characters has the same problem.

[74th]

Now, down motion supports only tabs at the top of the line.
I think it has this and other some problem.
I'm Japanese and often use multibyte characters, but I do not feel bad. I do not try it soon, sorry.