From 8c5308b5e8be4e6db41a9e2c0a2fdb096c64cfd4 Mon Sep 17 00:00:00 2001
From: Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
Date: Fri, 20 Mar 2020 07:38:33 +0900
Subject: [PATCH] [USER32] Relax conditions for creating MDI windows (#2454)

The creation conditions of MDI window was too strict. CORE-15633
---
 win32ss/user/user32/windows/window.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/win32ss/user/user32/windows/window.c b/win32ss/user/user32/windows/window.c
index e94d9a1b250..40f051d3b6d 100644
--- a/win32ss/user/user32/windows/window.c
+++ b/win32ss/user/user32/windows/window.c
@@ -411,7 +411,7 @@ CreateWindowExA(DWORD dwExStyle,
         if (pWndParent->fnid != FNID_MDICLIENT) // wine uses WIN_ISMDICLIENT
         {
            WARN("WS_EX_MDICHILD, but parent %p is not MDIClient\n", hWndParent);
-           return NULL;
+           goto skip_mdi;
         }
 
         /* lpParams of WM_[NC]CREATE is different for MDI children.
@@ -477,6 +477,7 @@ CreateWindowExA(DWORD dwExStyle,
         }
     }
 
+skip_mdi:
     hwnd = User32CreateWindowEx(dwExStyle,
                                 lpClassName,
                                 lpWindowName,
@@ -536,7 +537,7 @@ CreateWindowExW(DWORD dwExStyle,
         if (pWndParent->fnid != FNID_MDICLIENT)
         {
            WARN("WS_EX_MDICHILD, but parent %p is not MDIClient\n", hWndParent);
-           return NULL;
+           goto skip_mdi;
         }
 
         /* lpParams of WM_[NC]CREATE is different for MDI children.
@@ -602,6 +603,7 @@ CreateWindowExW(DWORD dwExStyle,
         }
     }
 
+skip_mdi:
     hwnd = User32CreateWindowEx(dwExStyle,
                                 (LPCSTR)lpClassName,
                                 (LPCSTR)lpWindowName,