[PATCH v5 5/5] win32u: Use the session shared object to implement is_window.

[Rémi Bernon]

From: Rémi Bernon

---
 dlls/win32u/window.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index 6c29cda990c..b8585367313 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -325,25 +325,16 @@ HWND is_current_process_window( HWND hwnd )
 /* see IsWindow */
 BOOL is_window( HWND hwnd )
 {
-    WND *win;
-    BOOL ret;
-
-    if (!(win = get_win_ptr( hwnd ))) return FALSE;
-    if (win == WND_DESKTOP) return TRUE;
+    struct object_lock lock = OBJECT_LOCK_INIT;
+    const session_shm_t *session_shm;
+    BOOL ret = FALSE;
+    UINT status;

-    if (win != WND_OTHER_PROCESS)
-    {
-        release_win_ptr( win );
-        return TRUE;
-    }
+    while ((status = get_shared_session( &lock, &session_shm )) == STATUS_PENDING)
+        ret = !!get_session_entry( session_shm, hwnd, NTUSER_OBJ_WINDOW );
+    if (status) ret = FALSE;

-    /* check other processes */
-    SERVER_START_REQ( get_window_info )
-    {
-        req->handle = wine_server_user_handle( hwnd );
-        ret = !wine_server_call_err( req );
-    }
-    SERVER_END_REQ;
+    if (!ret) RtlSetLastWin32Error( ERROR_INVALID_WINDOW_HANDLE );
     return ret;
 }