EdgeSpacing.only constructor
      const
      EdgeSpacing.only({ 
    
- SpacingUnit left = SpacingUnit.zero,
 - SpacingUnit right = SpacingUnit.zero,
 - SpacingUnit top = SpacingUnit.zero,
 - SpacingUnit bottom = SpacingUnit.zero,
 
Creates an EdgeSpacing with individual edge values.
Implementation
const EdgeSpacing.only({
  this.left = SpacingUnit.zero,
  this.right = SpacingUnit.zero,
  super.top,
  super.bottom,
}) : super();