[PATCH v4 3/4] server: Pass NULL as child region if region is NULL.

[Rémi Bernon]

From: Rémi Bernon

---
 server/window.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/window.c b/server/window.c
index b9953ef4296..dd092811d65 100644
--- a/server/window.c
+++ b/server/window.c
@@ -1686,7 +1686,7 @@ static void redraw_window( struct window *win, struct region *region, unsigned i
             if (rect_in_region( child_rgn, &child->window_rect ))
             {
                 offset_region( child_rgn, -child->client_rect.left, -child->client_rect.top );
-                redraw_window( child, child_rgn, flags | RDW_FRAME | RDW_ERASE );
+                redraw_window( child, region ? child_rgn : NULL, flags | RDW_FRAME | RDW_ERASE );
             }
         }
         free_region( child_rgn );