[PATCH v2 0/4] MR7219: win32u, winex11.drv: Fix multiple Vulkan surfaces handling.

[Paul Gofman (＠gofman)]

--
  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