How do you set the line-spacing for a multi-line NSTextField programmatically with Swift or within the Interface Builder?
You can use NSAttributedString to modify this (Swift 4 example):
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.lineSpacing = 10.0  // sets the space BETWEEN lines to 10 points
    paragraphStyle.maximumLineHeight = 12.0 // sets the MAXIMUM height of the lines to 12 points
    let text = "Your text"
    let attributes = [.paragraphStyle: paragraphStyle]
    textField.attributedStringValue = NSAttributedString(string: text, attributes: attributes)
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