XActionPane constructor
      const
      XActionPane({})
     
    
Creates an ActionPane.
The extentRatio argument must not be null and must be between 0
(exclusive) and 1 (inclusive).
The openThreshold argument must be null or between 0 and 1
(both exclusives).
The closeThreshold argument must be null or between 0 and 1
(both exclusives).
The children argument must not be null.
Implementation
const XActionPane({
  Key? key,
  this.extentRatio = _defaultExtentRatio,
  required this.motion,
  this.dismissible,
  this.dragDismissible = true,
  this.openThreshold,
  this.closeThreshold,
  required this.children,
})  : assert(extentRatio > 0 && extentRatio <= 1),
      assert(openThreshold == null || (openThreshold > 0 && openThreshold < 1)),
      assert(closeThreshold == null || (closeThreshold > 0 && closeThreshold < 1)),
      super(key: key);