Issue when drawing a canvas on another

[martinRenou]

The following seems to fail with the latest ipycanvas version:

image_data = canvas.get_image_data(x=0, y=0, width=64, height=64)
canvas2 = Canvas(width=64, height=64)   
canvas2.put_image_data( image_data, 0, 0 )

See https://github.com/martinRenou/ipycanvas/discussions/271