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v2: winex11.drv: Attach currently active Vulkan onscreen surface in vulkan_surface_update_offscreen().
win32u: Don't invalidate existing Vulkan surface when a new one is created for window.
win32u: Check for NULL hwnd before calling vulkan_surface_presented() driver callback.
https://gitlab.winehq.org/wine/wine/-/merge_requests/7219