Fixed errorneous dirty-redraw of siblings

gui/gui.c

@@ -845,10 +845,11 @@ void gui_generate_draw_commands_inner(
 
 	GUI_Node *sibling = GUI_NODE_SIBLING(node);
 	if(sibling != NULL) {
+		GUI_Node *parent = GUI_NODE_PARENT(node);
 		gui_generate_draw_commands_inner(
 			x_offset, y_offset,
 			sibling,
-			dirty || sibling->dirty,
+			parent->dirty || sibling->dirty,
 			draw_command_arena, out_num_draw_commands);
 	}
 	GUI_Node *first_child = GUI_NODE_FIRST_CHILD(node);