[Bug 59398] New: Vulkan child windows not excluded from parent GDI surface clip region

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59398

            Bug ID: 59398
           Summary: Vulkan child windows not excluded from parent GDI
                    surface clip region
           Product: Wine
           Version: 10.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: win32u
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 80359
  --> http://bugs.winehq.org/attachment.cgi?id=80359
git format patch

Longer explanation in the .patch attachment but TLDR;

vkCreateWin32SurfaceKHR
  → surface added to win->vulkan_surfaces list
  → update_window_state(hwnd)
    → [if cross-thread: posts WM_WINE_UPDATEWINDOWSTATE, returns]
    → get_window_surface(hwnd, ...) → returns NULL (due to window.c change #1)
    → apply_window_pos(hwnd, ...)
      → sends SET_WINPOS_PIXEL_FORMAT to server (due to window.c change #2)
      → server: sets PAINT_HAS_PIXEL_FORMAT on child
      → server: update_pixel_format_flags() sets PAINT_PIXEL_FORMAT_CHILD on
parents
      → server returns surface_win = parent that owns the GDI surface
    → update_surface_region(surface_win)
      → queries server for new surface clip region
      → server: get_surface_region() → clip_pixel_format_children() subtracts
Vulkan child rect
      → sets XSetClipRectangles on parent's GC, excluding Vulkan child area
  → Parent GDI flush no longer paints over Vulkan viewport

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