onDragSelectionEnd method Null safety
- DragEndDetails details
protected">@protected
    Handler for TextSelectionGestureDetector.onDragSelectionEnd.
By default, it simply cleans up the state used for handling certain built-in behaviors.
See also:
- TextSelectionGestureDetector.onDragSelectionEnd, which triggers this callback.
Implementation
@protected
void onDragSelectionEnd(DragEndDetails details) {
  if (_isShiftTapping) {
    _isShiftTapping = false;
    _shiftTapDragSelection = null;
  }
}