inputDecoratorBorderType property
Determines the type of border InputDecorator uses.
Defaults to FlexInputBorderType.outline to prefer the outline style.
To use the underline style set it to FlexInputBorderType.underline. The top of the decorator is still rounded according to overall defaultRadius also with underline borer type.
To change input decorator's border radius separately define inputDecorationRadius that will then override defaultRadius.
Implementation
final FlexInputBorderType inputDecoratorBorderType;