Support connecting noodle to another node and ensure it

stays connected when parent node moves

src/compositor.c

@@ -181,7 +181,8 @@ void add_node(compositor *comp, node_type type, node_data data, u64 inputs,
     return;
   }
 
-  line *noodles = mem_arena_alloc(comp->arena, inputs * sizeof(line));
+  u64 alloc_size = inputs * sizeof(ui_noodle_elem);
+  ui_noodle_elem *noodles = mem_arena_alloc(comp->arena, alloc_size);
   if (!noodles) {
     return;
   }