Consider newline length 1

[webpro]

In my opinion, the newline should be considered to have length 1. It's not zero-width like other control characters.

[fabiospampinato]

In what context does it occupy one space? 🤔

In the terminal it seems to occupy zero space:

Maybe we could make this customizable if you need that in a different context?

[webpro]

When truncating/splitting a string, one might want to include characters like \n and \t.

For example, I was building the "map position" helper at the bottom right of https://ansi.tools, and wanted the position to advance by 1 for newline characters.

Should probably be customizable indeed to set "greediness".

Perhaps a tab \t can serve as another example: if one wants to mark the truncated part with some background color, the tab should be included/marked as well (it's not zero-width). If you agree I can see if we should add this behavior for tabs as well in this PR.