Room for window provider to pass the X11 display

include/vlc_vout_window.h

@@ -92,6 +92,11 @@ struct vout_window_t {
         uint32_t xid;     /* X11 windows ID */
     };
 
+    /* display server (mandatory) */
+    union {
+        char     *x11_display; /* X11 display (NULL = use default) */
+    };
+
     /* Control on the module (mandatory)
      *
      * Do not use it directly; use vout_window_Control instead.

src/video_output/window.c

@@ -66,6 +66,7 @@ vout_window_t *vout_window_New(vlc_object_t *obj,
     case VOUT_WINDOW_TYPE_XID:
         type = "vout window xid";
         window->xid = 0;
+        window->x11_display = NULL;
         break;
     default:
         assert(0);