[PATCH 0/7] MR4565: winex11: Use helpers to attach / detach / destroy client windows.

[Rémi Bernon]

After some discussion on https://gitlab.winehq.org/wine/wine/-/merge_requests/4533, this refactors how child_window are handled to make it easier to decouple them from the whole_window, and eventually have multiple detached child_window for some Vulkan use case (possibly also GL).

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https://gitlab.winehq.org/wine/wine/-/merge_requests/4565