GTKMM 3: custom container and child's size change notifications

I’m developing a custom container.

The child used for testing is a 2x2 grid with four buttons.

Each button changes the grid size with set_size_request.

What’s the canonical way for a container to be notified about its child’s change of size?

I’m using the child’s signal_size_allocate but it seems it’s only called when the size grows.

signal_size_allocate is called when the size shrinks or grows, but when the child gets larger than the container, it’s not called anymore.

I restructured the layout method and the issue seems to be gone.

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