In Flutter, how can a positioned Widget feel taps outside of its parent Stack area?

This behavior occurs because the stack checks whether the pointer is inside its bounds before checking whether a child got hit:

Class: RenderBox (which RenderStack extends)

bool hitTest(BoxHitTestResult result, { @required Offset position }) {

    ...

    if (_size.contains(position)) {
      if (hitTestChildren(result, position: position) || hitTestSelf(position)) {
        result.add(BoxHitTestEntry(this, position));
        return true;
      }
    }
    return false;
}

My workaround is deleting the

if (_size.contains(position))

check.
Unfortunately, this is not possible without copying code from the framework.

Here is what I did:

• Copied the Stack class and named it Stack2
• Copied RenderStack and named it RenderStack2
• Made Stack2 reference RenderStack2
• Added the hitTest method from above without the _size.contains check
• Copied Positioned and named it Positioned2 and made it reference Stack2 as its generic parameter
• Used Stack2 and Positioned2 in my code

This solution is by no means optimal, but it achieves the desired behavior.