Children do not render parent gradient background correctly

[kkoreilly]

Describe the bug

Children re-render the entire parent gradient background compressed in their bounding box instead of rendering the relevant section consistently with the parent.

How to reproduce

Look at the gradient example in the frame docs.

Example code

No response

Relevant output

No response

Platform

macOS

[kkoreilly]

The issue here is that the gradient is updated in various places in paint based on the current bounding box, so somehow we need to inject the correct parent bounds into that.

[kkoreilly]

The same thing applies for other non-uniform backgrounds, such as images.