playlist: allow video-on-top variable to be preserved across vouts

src/playlist/engine.c

@@ -322,6 +322,7 @@ static void VariablesInit( playlist_t *p_playlist )
 
     /* Variables to preserve video output parameters */
     var_Create( p_playlist, "fullscreen", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
+    var_Create( p_playlist, "video-on-top", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 
     /* Audio output parameters */
     var_Create( p_playlist, "volume-muted", VLC_VAR_BOOL );

src/video_output/vout_intf.c

@@ -966,10 +966,6 @@ static int OnTopCallback( vlc_object_t *p_this, char const *psz_cmd,
     p_vout->b_on_top = newval.b_bool;
     vlc_mutex_unlock( &p_vout->change_lock );
 
-    /* Modify libvlc as well because the vout might have to be restarted */
-    var_Create( p_vout->p_libvlc, "video-on-top", VLC_VAR_BOOL );
-    var_Set( p_vout->p_libvlc, "video-on-top", newval );
-
     (void)psz_cmd; (void)oldval; (void)p_data;
     return VLC_SUCCESS;
 }