The minimum allowed scale.
The scale will be clamped between this and maxScale inclusively.
Scale is also affected by boundaryMargin. If the scale would result in viewing beyond the boundary, then it will not be allowed. By default, boundaryMargin is EdgeInsets.zero, so scaling below 1.0 will not be allowed in most cases without first increasing the boundaryMargin.
Defaults to 0.8.
Cannot be null, and must be a finite number greater than zero and less than maxScale.
final double minScale;