showTrailingIcon property
final
Specifies if the DropdownMenu should show the trailingIcon.
If trailingIcon is set, DropdownMenu will use that trailing icon, otherwise a default trailing icon will be created.
If showTrailingIcon is false, trailingIconFocusNode must be null.
If a value is provided for decorationBuilder and the resulting InputDecoration.suffixIcon is not null, showTrailingIcon has no effect.
Defaults to true.
Implementation
final bool showTrailingIcon;