[PATCH 1/1] win32u: Don't request a host window surface for child windows.

[Rémi Bernon]

From: Rémi Bernon

Fixes: b9879d5adc1cd98a6ceb7d087c4533fdd487bedb
---
 dlls/win32u/window.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index 8e1ec0370ed..4bb7151660c 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -1844,6 +1844,7 @@ static struct window_surface *create_window_surface( HWND hwnd, UINT swp_flags,
                                                      RECT *visible_rect, RECT *surface_rect )
 {
     BOOL shaped, needs_surface, create_opaque, is_layered;
+    HWND parent = NtUserGetAncestor( hwnd, GA_PARENT );
     struct window_surface *new_surface;
     RECT dummy;
     HRGN shape;
@@ -1855,6 +1856,7 @@ static struct window_surface *create_window_surface( HWND hwnd, UINT swp_flags,
     if (!user_driver->pWindowPosChanging( hwnd, swp_flags, shaped, window_rect, client_rect, visible_rect )) needs_surface = FALSE;
     else if (swp_flags & SWP_HIDEWINDOW) needs_surface = FALSE;
     else if (swp_flags & SWP_SHOWWINDOW) needs_surface = TRUE;
+    else if (parent && parent != NtUserGetDesktopWindow()) needs_surface = FALSE;
     else needs_surface = !!(NtUserGetWindowLongW( hwnd, GWL_STYLE ) & WS_VISIBLE);

if (!get_surface_rect( visible_rect, surface_rect )) needs_surface = FALSE;