Fix CJK character display width calculation

[hurou927]

Summary

• Fix overlapping rows when displaying CSV files containing CJK (Chinese, Japanese, Korean) characters
• Replace .len() (byte length) and .chars().count() (character count) with unicode-width crate for correct
  terminal display width calculation
• Handle line wrapping correctly for CJK characters (width 2) that don't fit in remaining column space

#199

[stsymbaliuk]

Hi @hurou927,
Looks like the original issue was not fixed by your current commit.
The issue is reproducible with csvlens 0.15.1 when I set too small font in my terminal. With larger fonts the issue is not reproducible with csvlens 0.15.1.
Also with your modifications I see no difference in csvlens behavior.
Here is a screenshot for build with your modifications. With such font size it still works:

But with small fort size it show overlapping:

Please confirm the same is reproducible for you.

[YS-L]

Thanks @stsymbaliuk for testing! I've pushed a fix in main that should fix the issue, more context here: #199 (comment)

[stsymbaliuk]

Thank you @YS-L ,
With the latest code from main branch the issue with test wrapping with small text size is fixed for me.