Change Height of NSTableHeaderView

How can i change the NSTableHeaderView correctly.

This works but the result is a bigger header with 2 gray lines.

Code Block
let f = 50
h.setFrameSize(NSSize.init(width: h.frame.size.width, height: f))


I do also change the font size of the header cell using:

Code Block
headerCell.attributedStringValue = ***

Change Height of NSTableHeaderView
 
 
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