Is it a good idea to animate by calling size_allocate?

[q962 (提及)]

There are many warning messages while flashing: 'Gtk-WARNING **: 22:35:16.987: Trying to snapshot 0x555555a1f080 without a current allocation'

I haven’t tried using snapshot to animate yet. I think that should fix the problem. Just make sure there is no problem within 300ms.

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Explanation: The effect in the figure is achieved by negative y.
The parent control is a horizontal box below.

[q962 (提及)]

I also implemented a collapsible list through size_allocate.
Adjacent controls respond to size changes. Although the adjacent controls haven’t been written yet. But how flickering still happens, that would be bad.