Chinese characters support issue about termbox-go

[nsf]

When working with characters that occupy more than one cell, you have to handle it yourself. There are handy libs like: https://github.com/mattn/go-runewidth, which can help you with that. Sadly I don't have much experience with it. There are examples contributed by other people though which use runewidth lib:

• https://github.com/nsf/termbox-go/blob/master/_demos/hello_world.go
• https://github.com/nsf/termbox-go/blob/master/_demos/editbox.go

Maybe try running them with Chinese input/text and if it works properly for you then look at the code. And I would suggest looking at alternative UI libs as well, such as https://github.com/rivo/tview. Proper text handling is complicated and most libs I saw use the mentioned above runewidth lib, e.g.: https://github.com/rivo/tview/blob/0e6b21a48e9606d07c6bf79171d6ce05d159f9f9/util.go#L456