Fixed truncation error for ASTextNode2.

[wanhmr]

I got a truncation error for Kittens sample.

An error occurred when I set the NSLineBreakMode to NSLineBreakByTruncatingMiddle.

[CLAassistant]

All committers have signed the CLA.

[wiseoldduck]

All bugfixes should be demonstrated with the kittens app 😸

Haha I discovered this lineBreakMode not working correctly basically just now adding some snapshot tests.

I think the bug can be fixed with a smaller change than this, but maybe this PR makes it more readable? I will review it more carefully tomorrow. 👍

[wanhmr]

@wiseoldduck I've added some screenshots of the kittens app and I think my current implementation is much cleaner.

I have added detailed comments to the code for this PR .

Thank you for review.

head

middle

end

[Adlai-Holler]

@wanhmr Thanks for the diff and the detailed screenshots. #1297 got in there first and should fix this. Let me know if not!