getOffsetForCaret method
Returns the offset at which to paint the caret.
The position
parameter must be relative to the node
's content.
Valid only after layout.
Implementation
@override
Offset getOffsetForCaret(TextPosition position) {
return _body!.getOffsetForCaret(position, _caretPrototype) +
(_body!.parentData as BoxParentData).offset;
}