wrong print of box with title including asian characters

[FLAGLORD]

If the title of box includes asian characters, it would not print in a pretty way.

┌─ 测试 ─┐
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pterm/box_printer.go

Line 243 in 20d3f63

if (maxWidth + p.RightPadding + p.LeftPadding - 4) < len(RemoveColorFromString(p.Title)) {

Len() is not suitable for asian characters. Maybe runewidth.StringWidth() is a better choice.

[MarvinJWendt]

Thanks for reporting the issue! Will be fixed in the next release.