magnification property Null safety
The zoomed-in rate of the magnifier, if it is used.
The default value is 1.0, which will not change anything. If the value is > 1.0, the center item will be zoomed in by that rate, and it will also be rendered as flat, not cylindrical like the rest of the list. The item will be zoomed out if magnification < 1.0.
Must be positive.
final double magnification;