         }
     }
 
+    /// System-applied height constraint, used to resize the format bar as necessary.
+    ///
+    fileprivate var heightConstraint: NSLayoutConstraint? = nil
 
     // MARK: - Initializers
 

        updateVisibleItemsForCurrentBounds()
    }


    // MARK: - Styles


        static let fixedSeparatorMidPointPaddingX = CGFloat(5)
        static let stackViewCompactSpacing = CGFloat(0)
        static let stackViewRegularSpacing = CGFloat(0)
        static let formatBarHeight = CGFloat(44)
        static let stackButtonWidth = Constants.formatBarHeight
        static let horizontalDividerHeight = CGFloat(1)
        static let trailingButtonMargin = CGFloat(12)
    }
