Fix alignment of multi-byte fullwidth character comments #575
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This fixes alignment of Japanese, Korean and Chinese fullwidth character comments.
The displayed widths of multi-byte fullwidth characters are generally
twice as large as the ASCII characters, but String#size returns only the number of characters.
So if the column comment contains fullwidth multibyte characters, the alignment is broken.
Monospaced font-family supporting multi-byte isn't used in GitHub diff view, you can confirm the fixed alignment with
font-family: "Osaka-mono", "MS Gothic";
.cf. https://gyazo.com/d878a077b7494f07bcc45ecf7c0adb62