Konva.Stage pointer capture does not allow creating shapes that extend beyond stage boundaries

[GeoffCox]

I want to create a new rectangle and allow the user to pick a starting point and drag to size the rectangle.

Repro:

1. Create a stage with a size smaller than the page.
2. Wire up pointerdown, pointermove, pointerup events.
3. On pointer down, create a shape and add it to the stage. Capture the pointer.
4. On pointer move, resize the shape based on the pointer movement. Ensure it has the pointer capture.
5. On pointer up, release the pointer.

Expected:
Like pointer capture on HTML elements, would continue to get pointer move events even when pointer is outside the stage.

Actual:

1. Shape is resized as the pointer moves within the stage.
2. Shape stops resizing if the pointer moves outside stage bounds.
3. Once pointer moves back within stage bounds, resizing continues.
4. If the mouse up is outside the stage bounds the on pointer up is never called.

Note: The Transformer allows dragging handles outside the stage boundaries and works great, but I can't find a way using stage to do the same thing with the pointer.

[GeoffCox]

I guess I'll need to implement my own mouse handling and then directly manipulate the shapes on the stage & layer. That should work out given I don't have to implement any drag handle mouse tracking since that part works correct.