[PATCH 0/1] MR9654: win32u: Update the window client surface even with no children.

[Rémi Bernon]

Based on a patch from brett.didemus on Bugzilla, thanks!

Fixes: 257364eb5f671b2fd63507373b0427b519dfa71d

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9654