Text in NSTextView with TextKit2 is cropped instead of being soft-wrapped

I noticed that sometimes TextKit2 decides to crop some text instead of soft-wrapping it to the next line.

This can be reproduced by running the code below, then resizing the window by dragging the right margin to the right until you see the text with green background (starting with “file0”) at the end of the first line.

If you now slowly move the window margin back to the left, you’ll see that for some time that green “file0” text is cropped and so is the end of the text with red background, until at some point it is soft-wrapped on the second line.

I just created FB18289242. Is there a workaround?

class ViewController: NSViewController {

    override func loadView() {
        let textView = NSTextView(frame: CGRect(x: 0, y: 0, width: 400, height: 400))
        let string = NSMutableAttributedString(string: "file0\t143548282\t1970-01-01T00:00:00Z\t1\t1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75", attributes: [.foregroundColor: NSColor.labelColor, .backgroundColor: NSColor.red.withAlphaComponent(0.2)])
        string.append(NSAttributedString(string: "file0\t143548290\t1970-01-01T00:05:00Z\t 2\t0f6460d0ed7825fed6bda0f4d9c14942d88edc7ff236479212e69f081815e6f1742c272753b77cc6437f06ef93a46271c6ff9513c68945075212434080e60c82", attributes: [.foregroundColor: NSColor.labelColor, .backgroundColor: NSColor.green.withAlphaComponent(0.2)]))
        textView.textContentStorage!.textStorage!.setAttributedString(string)
        textView.autoresizingMask = [.width, .height]
        let scrollView = NSScrollView(frame: CGRect(x: 0, y: 0, width: 400, height: 400))
        scrollView.documentView = textView
        scrollView.hasVerticalScroller = true
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        view = scrollView
    }

}