     self.triangleClosed = NSImage.fontAwesomeIcon(
       name: .caretRight,
       textColor: self.theme.directoryForeground,
-      dimension: 18
+      dimension: triangleImageSize
     )
     self.triangleOpen = NSImage.fontAwesomeIcon(
       name: .caretDown,
       textColor: self.theme.directoryForeground,
-      dimension: 18
+      dimension: triangleImageSize
     )
 
     self.lastThemeMark = theme.mark

}

private let columnWidthRightPadding = CGFloat(40)

    self.triangleClosed = NSImage.fontAwesomeIcon(
      name: .caretRight,
      textColor: self.theme.directoryForeground,
      dimension: triangleImageSize
    )
    self.triangleOpen = NSImage.fontAwesomeIcon(
      name: .caretDown,
      textColor: self.theme.directoryForeground,
      dimension: triangleImageSize
    )

    super.init(frame: .zero)

    NSOutlineView.configure(toStandard: self)
    self.delegate = self

    source
      .observeOn(MainScheduler.instance)
